Organocatalytic Asymmetric Friedel−Crafts Alkylation/Cyclization Cascade Reaction of 1-Naphthols and α,β-Unsaturated Aldehydes: An Enantioselective Synthesis of Chromanes and Dihydrobenzopyranes
作者:Liang Hong、Lei Wang、Wangsheng Sun、Kwokyin Wong、Rui Wang
DOI:10.1021/jo901409d
日期:2009.9.4
An enantioselective Friedel−Crafts alkylation/cyclization cascade reaction of 1-naphthols and α,β-unsaturated aldehydes promoted by diphenylprolinol ether has been developed. The method affords one-pot access to chiral and synthetically useful chromanes and dihydrobenzopyranes in high yields and enantioselectivities from readily available compounds. In addition, the addition/cyclization products could
已开发了由二苯基脯氨醇醚促进的1-萘酚与α,β-不饱和醛的对映选择性Friedel-Crafts烷基化/环化级联反应。该方法可从易得的化合物中一锅得到高收率和对映选择性的手性和合成上有用的苯并二氢吡喃和二氢苯并吡喃。另外,加成/环化产物可随后转化为各种天然产物和生物活性衍生物。根据实验结果和观察到的产物的绝对构型,提出了一种合理的机理来解释激活和不对称诱导的起源。