Enantioselective iodolactonization to prepare ε-lactone rings using hypervalent iodine
作者:Jenna L. Payne、Zihang Deng、Andrew L. Flach、Jeffrey N. Johnston
DOI:10.1039/d2sc01587k
日期:——
Despite the rapid growth of enantioselective halolactonization reactions in recent years, most are effective only when forming smaller (6,5,4-membered) rings. Seven-membered ε-lactones, are rarely formed with high selectivity, and never without conformational bias. We describe the first highly enantioselective 7-exo-trig iodolactonizations of conformationally unbiased ε-unsaturated carboxylic acids
尽管近年来对映选择性卤内酯化反应迅速增长,但大多数仅在形成较小的(6,5,4-元)环时才有效。七元 ε-内酯很少以高选择性形成,而且从来没有没有构象偏差。我们描述了第一个高度对映选择性的 7 - exo -trig iodolactonizations 构象无偏的 ε-不饱和羧酸,由双功能 BAM 催化剂、I 2和 I( III ) 试剂 (PhI(OAc) 2 :PIDA)的不寻常组合影响.