Chen, Po-An published the artcileA Binaphthyl-Based Scaffold for a Chiral Dirhodium(II) Biscarboxylate Ligand with α-Quaternary Carbon Centers, Application In Synthesis of 126613-06-7, the publication is ACS Catalysis (2017), 7(9), 6155-6161, database is CAplus.
A nonracemic rhodium(II) paddlewheel complex has been synthesized from binaphthalenedibutanoate biscarboxylate ligands derived from BINOL, and the resulting complex has been used in enantioselective carbene/alkyne cascade reactions. The ligand design was guided by requirements for α,α-di-Me substituted carboxylates and bidentate ligands to ensure high levels of catalytic activity. Previously disclosed chiral complexes lack these features, resulting in low product yields. The design successfully replicated or exceeded the yields of the unusually effective achiral catalyst for the cascade reaction, Rh2(esp)2, which often shows unique reactivity. Promising enantioselectivity was observed for the tandem insertion-cyclization reactions of aldehyde-derived hydrazone substrates to give fused bicyclic ethers (29-96% ee), showing that the new scaffold has significant potential.
ACS Catalysis published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C22H12F6O6S2, Application In Synthesis of 126613-06-7.
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