followed by reaction with alkyl halides provided the corresponding (Z)-α-alkylated products in high yields. The latter reaction was applied to the preparation of the dipeptide (Z)-fluoroalkene isostere of Sta-Ala, which is the central dipeptide unit in Pepstatin, a natural inhibitor of aspartate proteases.
发现具有δ-羟基的γ,γ-二
氟-α,β-烯酸酯与三烷基铝(R 3 Al)的反应被CuI·2LiCl促进,并以SN2'方式进行,从而产生了α-烷基化的(Z)-γ-
氟-β,γ-烯酸酯,同时用Me 2 CuLi还原γ,γ-二
氟-α,β-烯酸酯,然后与卤代烷反应,得到相应的(Z)-α-烷基化产物高产。后一反应用于制备Sta-Ala的二肽(Z)-
氟烯烃等排物,它是
天冬氨酸蛋白酶的天然
抑制剂Pepstatin中的中心二肽单元。