Regioselective and Stereoselective Nucleophilic Ring Opening of Trifluoromethylated Cyclic Sulfates: Asymmetric Synthesis of Both Enantiomers of <i>s</i><i>yn</i>-(3-Trifluoromethyl)isoserine
作者:Zhong-Xing Jiang、Feng-Ling Qing
DOI:10.1021/jo0497611
日期:2004.8.1
novel and efficient enantioselective synthesis of both enantiomers of syn-(3-trifluoromethyl)isoserine was achieved. Ring opening of trifluoromethylated cyclic sulfates 3, derived from enantiopure trifluoromethylated vicinal diols 2, with various nucleophiles occurred exclusively at C2 with inversion of chirality. Treatment of 4c and 4d, obtained by nucleophilic opening of 3a and 3b with PhCO2NH4, with
的两种对映体的一种新的和有效的对映选择性合成顺式- (3-三氟甲基)异丝氨酸达到了。衍生自对映体三氟甲基化邻位二醇2的三氟甲基化环状硫酸盐3与各种亲核试剂的开环仅在C2处发生手性反转。通过用(CF 3 SO 2)2 O用PhCO 2 NH 4亲核打开3a和3b,然后用叠氮化钠取代,琼斯氧化和氢解处理来处理4c和4d(2 S,3小号) - (ñ -苯甲酰基)-3-(三氟甲基)异丝氨酸9A和(2 - [R,3 - [R ) - (ñ -苯甲酰基)-3-(三氟甲基)异丝氨酸9B,分别。