Intramolecular Etherification and Polyene Cyclization of π-Activated Alcohols Promoted by Hot Water
作者:Feng-Zhi Zhang、Yan Tian、Guo-Xing Li、Jin Qu
DOI:10.1021/jo502636d
日期:2015.1.16
Hot water, acting as a mildly acidic catalyst, efficiently promoted intramolecular direct nucleophilic substitution reactions of unsaturated alcohols with heteroatom or carbon nucleophiles. In a mixed solvent of water and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), polyene cyclizations using allylic alcohols as initiators gave the desired cyclized products, and in neat HFIP, a tricyclization reaction
用作弱酸性催化剂的热水有效地促进了不饱和醇与杂原子或碳亲核试剂的分子内直接亲核取代反应。在水和1,1,1,1,3,3,3-六氟-2-丙醇(HFIP)的混合溶剂中,使用烯丙醇作为引发剂进行多烯环化,得到所需的环化产物,在纯HFIP中,进行三环化反应一种四环产物,化学产率为51%。