Catalytic and Highly Enantioselective Friedel−Crafts Alkylation of Aromatic Ethers with Trifluoropyruvate under Solvent-Free Conditions
作者:Jun-Ling Zhao、Li Liu、Yong Sui、Yu-Liang Liu、Dong Wang、Yong-Jun Chen
DOI:10.1021/ol0626037
日期:2006.12.1
[Structure: see text] Highly enantioselective Friedel-Crafts alkylation of simple and aromatic ethers (4a-l) with 3,3,3-trifluoropyruvate (3) was accomplished by using chiral (4R,5S)-DiPh-BOX(1b)-Cu(OTf)2 complex (1 mol %) as a catalyst under solvent-free conditions. Excellent yields and enantioselectivities (90-93% ee, after recrystallization up to 99% ee) of the Friedel-Crafts alkylation products were obtained
[结构:见正文]通过使用手性(4R,5S)-DiPh-BOX(1b)实现了3,3,3-三氟丙酮酸(3)对简单和芳族醚(4a-1)的高度对映选择性的Friedel-Crafts烷基化-Cu(OTf)2络合物(1 mol%)在无溶剂条件下作为催化剂。获得了Friedel-Crafts烷基化产物的极佳收率和对映选择性(重结晶后可达90-93%ee,至高达99%ee)。