Solvent-Dependent Enantiodivergence in the Chlorocyclization of Unsaturated Carbamates
作者:Atefeh Garzan、Arvind Jaganathan、Nastaran Salehi Marzijarani、Roozbeh Yousefi、Daniel C. Whitehead、James E. Jackson、Babak Borhan
DOI:10.1002/chem.201300189
日期:2013.7.1
A remarkable solvent‐controlled enantiodivergence is seen in the hydroquinidine 1,4‐phthalazinediyl diether ((DHQD)2PHAL)‐catalyzed chlorocyclization of unsaturated carbamates. Eyring plot analyses of this previously unreported reaction are used to probe and compare the R‐ and S‐selective pathways. In the CHCl3/hexanes solvent system, the pro‐R process shows a surprising increase in selectivity with
在对苯二酚1,4-酞嗪二基二醚((DHQD)2 PHAL)催化的不饱和氨基甲酸酯的氯环化反应中,溶剂控制的对映体分布显着。以前未报告的反应的Eyring图分析用于探测和比较R和S选择性途径。在CHCl 3 /己烷溶剂系统中,pro- R过程显示出随温度升高而出乎意料的选择性增加。这些研究指出,亲之间的强烈溶剂依赖性熵焓平衡- [R和亲小号通路。