Catalysed Asymmetric Protonation of Simple Linear Keto-Enolic Species − A Route to Chiral α-Arylpropionic Acids
作者:Olivier Roy、Abdelkhalek Riahi、Françoise Hénin、Jacques Muzart
DOI:10.1002/1099-0690(200212)2002:23<3986::aid-ejoc3986>3.0.co;2-l
日期:2002.12
The reaction cascade consisting of deprotection/decarboxylation/asymmetric protonation of enolic species, starting from open-chain benzyl β-oxo esters, has been studied. When carried out in the presence of catalytic amounts of cinchonine, the reaction gave optically active α-aryl ketones with up to 75% ee. Enantio-enriched (S)-3-phenyl-2-butanone can be converted into 2-phenylpropionic acid without
已经研究了从开链苄基 β-氧代酯开始,由烯醇类物质的脱保护/脱羧/不对称质子化组成的反应级联反应。当在催化量的辛可宁存在下进行时,反应得到具有高达 75% ee 的光学活性 α-芳基酮。对映体富集的 (S)-3-苯基-2-丁酮无需外消旋化即可转化为 2-苯基丙酸。(© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)