Reaction of N-(2,4,6-trimethylphenylsulfonyl)-γ,δ-cis- or -trans-γ,δ-epimino (E)-α,β-enoates with acids such as TFA or methanesulfonic acid (MSA) affords the stereo- and regio-selective ring-opened products in high yields, and subsequent treatment of resulting δ-aminated γ-mesyloxyα,β-enoates with organocopper reagents yields diastereoisomerically pure (E)-alkene dipeptide isosteres.
N-(2,4,6-三甲基苯磺酰基)-δ³,δ-顺式或反式-δ³,δ-表
亚胺 (E)-δ±,δ-烯酸盐与反式
脂肪酸或
甲磺酸 (M
SA) 等酸反应,可获得高产率的立体和区域选择性开环产物、随后用
有机铜试剂处理生成的δ-
氨基δ-甲酰氧基δ,δ-烯酸盐,可得到非对映异构体纯度很高的(E)-烯二肽异构体。