In 2022,Rekha; Sharma, Sonam; Singh, Gurdeep; Vijaya Anand, Ramasamy published an article in ACS Organic & Inorganic Au. The title of the article was 《Tropylium Salt-Promoted Vinylogous Aza-Michael Addition of Carbamates to para-Quinone Methides: Elaboration to Diastereomerically Pure α,α’-Diarylmethyl Carbamates》.Formula: C5H11NO2 The author mentioned the following in the article:
A tropylium cation-promoted vinylogous aza-Michael addition of carbamates to para-quinone methides (QMs) to access a wide range of unsym. α,α’-diarylmethyl carbamates I [R1 = Ph, 2-naphthyl, 2-thienyl, etc.; R2 = Et, i-Pr, t-Bu] was reported. This mild protocol was effective for the vinylogous conjugate addition of (-)-menthyl carbamate to p-QMs, and the resp. diastereomerically pure α,α’-diarylmethyl carbamate derivatives II [R3 = Ph, 4-MeOC6H4, 3-O2NC6H4, etc.] could be obtained in excellent yields and diastereoselectivities (up to >20:1 de).tert-Butyl carbamate(cas: 4248-19-5Formula: C5H11NO2) was used in this study.
tert-Butyl carbamate(cas: 4248-19-5) belongs to anime. Milder oxidation, using reagents such as NaOCl, can remove four hydrogen atoms from primary amines of the type RCH2NH2 to form nitriles (R―C≡N), and oxidation with reagents such as MnO2 can remove two hydrogen atoms from secondary amines (R2CH―NHR′) to form imines (R2C=NR′). Tertiary amines can be oxidized to enamines (R2C=CHNR2) by a variety of reagents.Formula: C5H11NO2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics