Enantioselective Synthesis of Triarylmethanes via Intermolecular C–H Functionalization of Cyclohexadienes with Diaryldiazomethanes
作者:Maizie Lee、Huw M. L. Davies
DOI:10.1021/acs.orglett.3c00845
日期:2023.6.9
Rhodium-catalyzed C–H functionalization of cyclohexadiene derivatives with diaryldiazomethanes followed by oxidation with DDQ provides ready access to triarylmethanes. Two chiral dirhodium tetracarboxylates, Rh2(S-PTAD)4 and Rh2(S-TPPTTL)4, were found to be the optimum chiral catalysts for these transformations. This method showcases the ability of diaryldiazomethanes to perform intermolecular C–H
用二芳基重氮甲烷对环己二烯衍生物进行铑催化的 C-H 官能化,然后用 DDQ 进行氧化,可以方便地获得三芳基甲烷。两种手性四羧酸二铑,Rh 2 ( S -PTAD) 4和Rh 2 ( S -TPPTTL) 4被发现是这些转化的最佳手性催化剂。该方法展示了二芳基重氮甲烷以高对映选择性和良好产率进行分子间 C-H 插入的能力。该方法底物范围广泛,可产生具有多种芳基和杂芳基取代基的三芳基甲烷产物,包括苯并呋喃和吡啶杂环。