Preparation of chiral indanones and dihydrocoumarins; application to synthesis of (+)-3-(2,6-dimethoxyphenyl) pentanoic acid
摘要:
Chiral beta-aryl carboxylic acids, prepared by Michael addition of organocuprates to chiral unsaturated imides, are transformed into chiral 3-alkyl-4-benzoyloxyindan-1-ones via two intramolecular acylations, with intermediate formation of chiral 3-alkylindanones and corresponding dihydrocoumarins. The 3-(S)-ethyl-4-benzoyloxyindanone is transformed into(+)-3-(S)-(2,6-dimethoxyphenyl)pentanoic acid.
Preparation of chiral indanones and dihydrocoumarins; application to synthesis of (+)-3-(2,6-dimethoxyphenyl) pentanoic acid
摘要:
Chiral beta-aryl carboxylic acids, prepared by Michael addition of organocuprates to chiral unsaturated imides, are transformed into chiral 3-alkyl-4-benzoyloxyindan-1-ones via two intramolecular acylations, with intermediate formation of chiral 3-alkylindanones and corresponding dihydrocoumarins. The 3-(S)-ethyl-4-benzoyloxyindanone is transformed into(+)-3-(S)-(2,6-dimethoxyphenyl)pentanoic acid.
Continuous‐Flow Enantioselective Hydroacylations under Heterogeneous Chiral Rhodium Catalysts
作者:Yuki Saito、Shū Kobayashi
DOI:10.1002/anie.202313778
日期:2024.1.2
Heterogeneous chiral Rh catalysts were developed for continuous-flow enantioselective hydroacylations. The prepared catalysts exhibited excellent activity and enantioselectivity affording optically active ketones in quantitative yields with 99 % ee's without the leaching of Rh. The catalysts exhibited a wide substrate scope and, in sequential-flow reactions, the flow syntheses of value-added chemicals
开发了用于连续流对映选择性加氢酰化的非均相手性 Rh 催化剂。所制备的催化剂表现出优异的活性和对映选择性,以定量产率提供光学活性酮,其 ee 为 99%,且没有 Rh 浸出。该催化剂表现出广泛的底物范围,并且在顺序流动反应中,证明了增值化学品的流动合成。