Construction of Trifluoromethyl-Bearing Quaternary Carbon Centers by Intramolecular Decarboxylative Allylation of α-Trifluoromethyl β-Keto Esters
作者:Norio Shibata、Satoru Suzuki、Tatsuya Furukawa、Hiroyuki Kawai、Etsuko Tokunaga、Zhe Yuan、Dominique Cahard
DOI:10.1002/adsc.201100359
日期:2011.8
A new palladium-catalyzed decarboxylative allylation of allyl α-trifluoromethyl-β-keto esters was developed in the presence of tris(dibenzylideneacetone)dipalladium [Pd2(dba)3] and 1,2-bis(diphenylphosphino)ethane (dppe) in tetrahydrofuran. α-Trifluoromethyl ketones featuring a quaternary carbon center were produced in good yields and the dreaded α,β-unsaturated-β,β-difluoro ketones resulting from
在三(二亚苄基丙酮)二钯[Pd 2(dba)3 ]和1,2-双(二苯膦基)乙烷(dppe)存在下,开发了一种新的钯催化的烯丙基α-三氟甲基-β-酮酯的脱羧烯丙基化反应。四氢呋喃。以良好的产率生产具有季碳中心的α-三氟甲基酮,未观察到由于β-消除氟离子而产生的可怕的α,β-不饱和-β,β-二氟酮。