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。