Planar Chirality Change in Dediazoniation Reactions of Paracyclophanes and Mechanistic Implication
作者:Fuyan He、Yudao Ma、Lei Zhao、Wenzeng Duan、Jianqiang Chen、Chun Song
DOI:10.1021/ol302510t
日期:2012.11.2
Dediazoniation reactions of (Sp)-4-bromo-13-[2.2]paracyclophanyldiazonium fluoborate 2a through a heterolytic cleavage process gave products with partial racemization. In contrast, dediazoniation reactions of (Sp)-2a undergoing a nonheterolytic cleavage process afforded products with retention of configuration. A key intermediate, the bromonium cation B, caused the racemization. The unexpected racemization
An Efficient Catalyst System for Pd-Catalyzed Amination of [2.2]Paracyclophanyl Bromides
作者:Bo Qu、Yudao Ma、Qingshuang Ma、Xiao Liu、Fuyan He、Chun Song
DOI:10.1021/jo901310a
日期:2009.9.4
A practical Buchwald-Hartwig amination of [2.2]paracyclophanyl bromides with benzhydrylideneamine is developed. The method provides a Facile route to a variety of imino and amino [2.2]paracyclophanes that are otherwise not readily synthesized.