Enantioselective Palladium-Catalyzed Oxidative Cascade Cyclization of Aliphatic Alkenyl Amides
作者:Wei Du、Qiangshuai Gu、Yang Li、Zhenyang Lin、Dan Yang
DOI:10.1021/acs.orglett.6b03410
日期:2017.1.20
The catalyst system of Pd(TFA)2/(S,S)-diPh-pyrox is reported to promote the highly efficient enantioselective oxidative cascade cyclization of alkene-tethered aliphatic acrylamides under mild aerobic conditions. A series of pyrrolizidine derivatives have been synthesized in good yield and excellent enantioselectivity. Deuterium-labeling experiments have revealed that the reaction proceeded through
据报道,Pd(TFA)2 /(S,S)-diPh-pyrox的催化剂体系可在温和的好氧条件下促进链烯键合的脂肪族丙烯酰胺的高效对映选择性氧化级联环化反应。已经以高收率和优异的对映选择性合成了一系列吡咯并咪唑衍生物。氘标记实验表明,该反应以高选择性通过反氨基palpalation(anti -AP)途径进行。已计算出抗-AP步骤的过渡态,以说明观察到的对映选择性。