Tag: M.W=150-200

Hoffman, Robert V.; Kim, Hwa Ok published the artcile< The preparation of 2-hydrazinyl esters in high optical purity from 2-sulfonyloxy esters>, Recommanded Product: (S)-Dimethyl 2-hydroxysuccinate, the main research area is hydrazine ester enantiospecific; sulfonyloxy hydrazine ester enantiospecific.

Chiral 2-triflyloxy esters, prepared from chiral 2-hydroxy esters, react enantiospecifically with BocNHNH2 to produce optically pure 2-hydrazinyl ester derivatives in high yields. The reaction of 2-nosyloxy esters with BocNHNH2 gives 2-(Boc-hydrazinyl) esters, thus providing an efficient (albeit slow) method for the conversion of esters to 2-hydrazinyl ester derivatives

Tetrahedron Letters published new progress about Carboxylic esters Role: SPN (Synthetic Preparation), PREP (Preparation). 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Recommanded Product: (S)-Dimethyl 2-hydroxysuccinate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhang, Shiping; Yang, Jing; Liu, Xiaoyun; Chang, Jianhua; Cao, Amin published the artcile< Synthesis and Characterization of Poly(butylene succinate-co-butylene malate): A New Biodegradable Copolyester Bearing Hydroxyl Pendant Groups>, Related Products of 617-55-0, the main research area is biodegradable chiral polybutylene succinate malate synthesis thermal optical property.

A new biodegradable copolyester, poly(butylene succinate-co-butylene malate) P(BS-co-BM), has been preliminarily prepared with optically active centers and lateral hydroxyl functional groups via a four-step synthetic strategy. First, an optically active benzyl-protected di-Me malate was synthesized from a starting material of (S)-di-Me malate and purified with good yield. Then, copolyester poly(butylene succinate-co-benzyl-protected butylene malate), P(BS-co-BBM), was prepared through a skilled condensation copolymerization of the benzyl-protected di-Me malate, di-Me succinate, and 1,4-butanediol in the presence of titanium tetraisopropoxide as the catalyst. Finally, a Pd/C catalyzed hydrogenation was applied to eliminate the benzyl protection group in a mixed solution of THF and methanol; thus the target copolyester P(BS-co-BM) was attained. On the other hand, phys. properties of the synthesized copolyesters were systematically characterized by means of NMR spectrometer, Fourier transformed IR spectrometer, gel permeation chromatog., optical polarimeter, quant. hydroxyl titration, and thermal anal. instruments. The exptl. evidence demonstrated a successful construction of the product P(BS-co-BM) bearing lateral hydroxyl functional groups. It was also revealed that the lower BBM unit content was in the benzyl-protected optically active P(BS-co-BBM) copolyester, the higher m.p. Tm, crystallinity, the broader mol. distribution, and the lower glass transition temperature Tg would be detected, and these results can be accounted for the presence of bulky lateral benzyl moieties. In contrast, the deprotected product P(BS-co-55 mol % BM) showed a higher Tm, crystallinity and lower Tg than its counterpart P(BS-co-55 mol % BBM). Interestingly, a thermal stability as high as that of the linear PBS was observed for P(BS-co-55 mol % BM) while a strong BBM unit content dependence of thermal stability was detected for the benzyl-protected copolyester P(BS-co-BBM)s. Therefore, these results may be beneficial for the new optically active P(BS-co-BM) bearing hydrophilic hydroxyl functional groups as a potential biomaterial.

Biomacromolecules published new progress about Fusion enthalpy. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Related Products of 617-55-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Pramanick, Pranab K.; Zhou, Zhibing; Hou, Zhenlin; Ao, Yufei; Yao, Bo published the artcile< Native amine-directed site-selective C(sp3)-H arylation of primary aliphatic amines with aryl iodides>, Reference of 2743-40-0, the main research area is aliphatic amine preparation aryl iodide regioselective arylation; aralkyl amine preparation.

A simple and efficient method for site-selective C(sp3)-H arylation of primary aliphatic amines by aryl iodides were established. In the presence of only 5 mol% Pd(OAc)2, a wide range of aliphatic amines including O-benzyl and O-silyl amino alcs. were arylated at γ- or δ-positions by aryl iodides containing a broad scope of functional groups. The synthetic application of this method had also been demonstrated by large-scale synthesis, the synthesis of a fingolimod analog and the conjugation with natural D-menthol and fluorescent 1,8-naphthalimide.

Chinese Chemical Letters published new progress about Aliphatic amines Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 2743-40-0 belongs to class esters-buliding-blocks, and the molecular formula is C8H18ClNO2, Reference of 2743-40-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Voigt, Benjamin; Mahrwald, Rainer published the artcile< Organocatalyzed cascade reactions of carbohydrates - a direct access to C-glycosides>, Electric Literature of 60705-25-1, the main research area is C glycoside preparation; proline catalyzed Knoevenagel oxa Michael cascade monosaccharide ketoester.

An organocatalyzed transformation to elongate unprotected carbohydrates is described. This operationally simple methodol. is based on a Knoevenagel-oxa-Michael cascade. This reaction is catalyzed by proline and DBU. Products were obtained with exceptional high degrees of stereoselectivity.

Chemical Communications (Cambridge, United Kingdom) published new progress about C-Glycosides Role: SPN (Synthetic Preparation), PREP (Preparation). 60705-25-1 belongs to class esters-buliding-blocks, and the molecular formula is C7H12O5, Electric Literature of 60705-25-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Selvakumar, N.; Azhagan, A. Malar; Srinivas, D.; Krishna, G. Gopi published the artcile< A direct synthesis of 2-arylpropenoic acid esters having nitro groups in the aromatic ring: a short synthesis of (±)-coerulescine and (±)-horsfiline>, Name: Methyl 2-(2-nitrophenyl)acetate, the main research area is coerulescine synthesis; horsfiline synthesis; arylpropenoic acid ester nitro preparation; propenoic acid ester arylnitro preparation.

A short synthesis of 2-arylpropenoic acid esters that possess nitro groups in their Ph ring using common and less expensive reagents is described. The usefulness of this methodol. is substantiated by the efficient total syntheses of (±)-coerulescine (I) and (±)-horsfiline from the 2-arylpropenoic acid esters obtained.

Tetrahedron Letters published new progress about Nitro group. 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Name: Methyl 2-(2-nitrophenyl)acetate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Voigt, Benjamin; Mahrwald, Rainer published the artcile< Organocatalyzed cascade reactions of carbohydrates - a direct access to C-glycosides>, Electric Literature of 60705-25-1, the main research area is C glycoside preparation; proline catalyzed Knoevenagel oxa Michael cascade monosaccharide ketoester.

An organocatalyzed transformation to elongate unprotected carbohydrates is described. This operationally simple methodol. is based on a Knoevenagel-oxa-Michael cascade. This reaction is catalyzed by proline and DBU. Products were obtained with exceptional high degrees of stereoselectivity.

Chemical Communications (Cambridge, United Kingdom) published new progress about C-Glycosides Role: SPN (Synthetic Preparation), PREP (Preparation). 60705-25-1 belongs to class esters-buliding-blocks, and the molecular formula is C7H12O5, Electric Literature of 60705-25-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Breen, Christopher P.; Parrish, Christine; Shangguan, Ning; Majumdar, Sudip; Murnen, Hannah; Jamison, Timothy F.; Bio, Matthew M. published the artcile< A Scalable Membrane Pervaporation Approach for Continuous Flow Olefin Metathesis>, Formula: C11H19NO2, the main research area is scalable membrane pervaporation olefin metathesis.

The translation of olefin metathesis reactions from the laboratory to process scale has been challenging with traditional batch techniques. In this contribution, we describe a continuous membrane reactor design that selectively permeates the ethylene byproduct from metathetical processes, thereby overcoming the mass-transport limitations that have neg. influenced the efficiency of this transformation in batch vessels. The membrane sheet-in-frame pervaporation module yielded turnover numbers of >7500 in the case of di-Et diallylmalonate ring-closing metathesis. The preparation of more challenging, low-effective-molarity substrates, a cyclooctene and a 14-membered macrocyclic lactone, was also effective. A comparison of optimal membrane reactor conditions to a sealed tubular reactor revealed that the benefits of ethylene removal are most apparent at low reaction concentrations

Organic Process Research & Development published new progress about Flow. 151259-38-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H19NO2, Formula: C11H19NO2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Marchalin, Stefan; Chudik, Miloslav; Cvopova, Katarina; Kozisek, Jozef; Lesko, Jan; Daich, Adam published the artcile< Conformationally constrained 1,4-DHPs. A convenient route to bis-1,4-DHPs as a novel class of nitrogen compounds>, Recommanded Product: Methyl 4,4-dimethoxy-3-oxobutanoate, the main research area is pyridine dihydro preparation tandem Knoevenagel condensation aminonitrile cyclization; indolizine preparation; dihydropyridine bis preparation; active methylene compound dihydropyridine Knoevenagel condensation aminonitrile cyclization.

On heating in glacial AcOH, 2-formyl-1,4-dihydropyridines I (R1 = MeCO, Me2CHO2C; R2 = 3-O2NC6H4, 5-nitro-2-furyl) underwent the tandem Knoevenagel condensation/aminonitrile cyclization with activated methylene reagents, such as Me acetoacetate or benzoylacetonitrile, to afford highly functionalized indolizines II (R3 = CN, MeO2C) in 65-88% yields. However, treatment of I (R1 = CN, MeCO, MeO2C, Me2CHO2C; R2 = 3-O2NC6H4, 5-cyano-2-furyl, 2-thienyl, etc.) with 3-aminocrotonitrile gave the Knoevenagel condensation products, bis-1,4-dihydropyridines III, as the major products in 50-82% yields.

Tetrahedron published new progress about Crystal structure. 60705-25-1 belongs to class esters-buliding-blocks, and the molecular formula is C7H12O5, Recommanded Product: Methyl 4,4-dimethoxy-3-oxobutanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Duan, Guiyun; Liu, Hao; Zhang, Liqing; Yuan, Chunhao; Li, Yongchao; Ge, Yanqing published the artcile< Access to 6-hydroxy indolizines and related imidazo[1,5-a]pyridines through the SN2 substitution/condensation/tautomerization cascade process>, Category: esters-buliding-blocks, the main research area is indolizine preparation; imidazopyridine preparation; pyrrole carbaldehyde acetoacetic ester substitution condensation tautomerization cascade.

A simple and efficient cascade reaction was developed for the construction of hydroxy substituted indolizines I [R1 = CHO, COMe, I, etc.; R2 = H, COOMe, Cl, etc.] and imidazopyridines II [R3 = H, Me; R4 = Me, Et] from pyrrole-2-carbaldehydes and com. available 4-halogenated acetoacetic esters. Their optical properties were also evaluated.

RSC Advances published new progress about Condensation reaction. 7126-50-3 belongs to class esters-buliding-blocks, and the molecular formula is C8H9NO3, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hong, Chao; Yu, Shuling; Liu, Zhanxiang; Zhang, Yuhong published the artcile< Rh-Catalyzed Coupling of Acrylic/Benzoic Acids with α-Diazocarbonyl Compounds: An Alternative Route for α-Pyrones and Isocoumarins>, Formula: C11H12O3, the main research area is alkyl oxo aryl pyran carboxylate preparation; acrylic acid alpha diazocarbonyl compound coupling catalyst rhodium; isochromene alkyl oxo carboxylate preparation; aryl carboxylic acid alpha diazocarbonyl compound coupling catalyst rhodium.

A coupling of acrylic acids/benzoic acids with α-diazocarbonyl compounds had been realized by a combined catalytic system of rhodium catalyst and Zn(OAc)2 additive. The presence of Zn(OAc)2 obviously accelerates the C(sp2)-H activation and destructed the formation of carboxylic ester that was formed via a nucleophilic O-H insertion to metal carbenoid. The procedure featured mild reaction conditions and broad substrate scope, providing a straightforward approach to the synthesis of α-pyrones I [R1 = Me, Ph, Bn, etc.; R2 = H, Me, Ph; R1R2 = (CH2)4; R3 = Me, Et, allyl, t-Bu, R4 = Me, Et, Ph, etc.] and isocoumarins II [R = H, 8-Me, 8-Me-6-MeO, etc.] without the transformation of carboxylic acids to the corresponding amides.

Organic Letters published new progress about 1,3-Dicarbonyl compounds Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Formula: C11H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics