An Enantioselective Strategy for the Synthesis of (<i>S</i>)-Tylophorine via One-Pot Intramolecular Schmidt/Bischler–Napieralski/Imine-Reduction Cascade Sequence
作者:Bo Su、Fazhong Chen、Qingmin Wang
DOI:10.1021/jo302725q
日期:2013.3.15
A novel enantioselective strategy for the total synthesis of (S)-tylophorine was developed in an overall yield of 48% with more than 99% ee from readily avaliable azido acid and phenanthryl alcohol. This route features an Evans stereoselective alkylation and an unprecedented one-pot intramolecular Schmidt/Bischler–Napieralski/imine-reduction cascade sequence, in which three new bonds and two rings
从容易获得的叠氮酸和菲醇开发了一种新颖的对映选择性策略,用于全合成(S)-酪氨酸的总收率为48%,ee超过99%。该路线具有Evans立体选择性烷基化作用和前所未有的单锅分子内Schmidt / Bischler-Napieralski /亚胺还原级联序列,其中三个新键和两个环的产率为84%。叠氮基醛的分子内施密特重排被证明是无外消旋的。