Substituent and Lewis Acid Promoted Dual Behavior of Epoxides towards [3+2]-Annulation Reactions with Donor-Acceptor Cyclopropanes: Synthesis of Substituted Cyclopentane and Tetrahydrofuran
作者:Ashok Kumar Pandey、Rohit Kumar Varshnaya、Prabal Banerjee
DOI:10.1002/ejoc.201601549
日期:2017.3.27
substituents present in both reacting partners produced different products. The C-attack gave functionalized cyclopentane derivatives while the O-attack furnished tetrahydrofuran derivatives via [3+2]-annulation reactions. Moreover, to increase the utility of our method, synthesized diasteriomeric cyclopentane derivatives were converted into synthetically useful cyclopentene and cyclopentanone analog.
取代基和路易斯酸促进从环氧化物生成官能化烯醇化物。烯醇化物对供体-受体环丙烷的不同攻击,即 C-攻击或 O-攻击,取决于两个反应伙伴中存在的取代基,产生不同的产物。C-攻击产生官能化的环戊烷衍生物,而O-攻击通过[3+2]-环化反应提供四氢呋喃衍生物。此外,为了提高我们方法的实用性,合成的非对映环戊烷衍生物被转化为合成有用的环戊烯和环戊酮类似物。