Highly (<i>E</i>)-Selective Trisubstituted Alkene Synthesis by Low-Valent Titanium-Mediated Homolytic Cleavage of Alcohol C–O Bond
作者:Takuya Suga、Ryusei Takada、Shoma Shimazu、Mizuki Sakata、Yutaka Ukaji
DOI:10.1021/acs.joc.2c00246
日期:2022.6.3
radical–ionic reactions. Benzyl alcohols treated with TiCl4(col) (col = 2,4,6-collidine) and Mn powder generated the corresponding benzyl radicals; in addition, their reaction with 2-carboxyallyl acetates and the subsequent elimination of the acetoxy group yielded α,β-unsaturated carbonyl compounds with exclusive (E)-stereoselectivity. The simplicity of the procedure and its wide substrate scope represent a
Ti 介导的均裂 C-O 键断裂可用于级联自由基-离子反应。TiCl 4 (col) (col = 2,4,6-可力丁)和Mn粉处理的苄醇产生相应的苄基自由基;此外,它们与乙酸 2-羧基烯丙酯的反应和随后的乙酰氧基的消除产生了具有排他性 ( E )-立体选择性的 α,β-不饱和羰基化合物。该程序的简单性及其广泛的底物范围代表了与反应相关的缺点的解决方案。