Asymmetric chroman synthesis via an intramolecular oxy-Michael addition by bifunctional organocatalysts
作者:Ryota Miyaji、Keisuke Asano、Seijiro Matsubara
DOI:10.1039/c3ob41938j
日期:——
organocatalysts facilitate the catalytic asymmetric synthesis of chroman derivatives via an intramolecular oxy-Michael addition reaction. Phenol derivatives bearing an easily available (E)-α,β-unsaturated ketone or a thioester moiety are useful substrates for the title transformation. This method represents a facile synthesis of various optically active 2-substituted chromans in high yield.
基于金鸡纳生物碱-脲的双官能有机催化剂通过分子内的氧-迈克尔加成反应促进了苯并二氢吡喃衍生物的催化不对称合成。带有容易获得的(E)-α,β-不饱和酮或硫酯部分的酚衍生物是用于标题转化的有用底物。该方法代表了以高收率容易地合成各种光学活性2-取代的苯并二氢吡喃。