Asymmetric organocatalytic reactions of o-hydroxycinnamaldehydes with organoboronic acids: a facile enantioselective access to chromanes and dihydrobenzopyranes
作者:Kwang-Su Choi、Sung-Gon Kim
DOI:10.1016/j.tetlet.2010.07.138
日期:2010.9
4-addition reactions of organoboronic acids to o-hydroxycinnamaldehydes, which afford chromanes and dihydrobenzopyranes, have been established using an organocatalyst derived from imidazolidinone. The chromanes have been obtained in high chemical yields and enantioselectivities and can be readily used to obtain a variety of chromane derivatives through subsequent transformations.
使用衍生自咪唑烷酮的有机催化剂已经建立了有机硼酸与邻-羟基肉桂醛的催化不对称1,4-加成反应,提供了苯并二氢吡喃和二氢苯并吡喃。以高化学产率和对映选择性获得了苯并二氢吡喃,并可以容易地用于通过随后的转化获得各种苯并二氢吡喃。