The rational design of modified Cinchona alkaloid catalysts. Application to a new asymmetric synthesis of chiral chromanes
作者:Alain Merschaert、Pieter Delbeke、Désiré Daloze、Georges Dive
DOI:10.1016/j.tetlet.2004.04.090
日期:2004.6
step is the intramolecular conjugate addition of a phenolic nucleophile on a α,β-unsaturated ester catalyzed by Cinchona alkaloids. The high ee’s obtained with cinchonine and its derivatives have been rationalized by ab initio quantum chemistry calculations of transition state structures.
已经实现了2-取代的手性苯并二氢吡喃的新的不对称合成。关键步骤是在金鸡纳生物碱催化的α,β-不饱和酯上分子内共轭酚类亲核试剂。用金鸡宁及其衍生物获得的高ee已通过对过渡态结构进行从头算量子化学计算得到合理化。