Catalytic Route to the Synthesis of Optically Active β,β-Difluoroglutamic Acid and β,β-Difluoroproline Derivatives
作者:Atsushi Suzuki、Masayuki Mae、Hideki Amii、Kenji Uneyama
DOI:10.1021/jo049789c
日期:2004.7.1
amino acid derivatives were synthesized via Mg(0)-promoted defluorination of α-trifluoromethyl iminoester. Bromination of the difluoroenamine afforded the bromodifluoromethyl iminoester in good yield. Pd-catalyzed asymmetric hydrogenation of the bromodifluoromethyl iminoester and the subsequent transformations provided optically active β,β-difluoroglutamic acid and β,β-difluoroproline derivatives.
通过Mg(0)促进α-三氟甲基亚氨基酯的脱氟合成了β,β-二氟氨基酸衍生物。二氟烯胺的溴化以良好的收率提供了溴二氟甲基亚氨基酯。Pd催化的溴代二氟甲基亚氨基酯的不对称氢化反应和随后的转化提供了光学活性的β,β-二氟谷氨酸和β,β-二氟脯氨酸衍生物。