Treatment of RMgX (1 equiv. R = alkyl; X = Cl, Br) with ZnCl2 (1 equiv.) in a mixed solvent of THF and Et2O leads to a highly turbid white suspension. Addition of LiCl (1∼2 equiv.) solubilizes the insoluble species to yield a colorless clear solution. Addition of a catalytic amount of a Cu(II)-salt followed by allylic halides or mesylates at 0 °C ∼ room temperature yielded SN2′products in high yields
在THF和Et 2 O的混合溶剂中用ZnCl 2(1当量)处理RMgX(1当量R =烷基; X = Cl,Br),会导致高度混浊的白色悬浮液。加入LiCl(1〜2当量)可溶解不溶物,得到无色澄清溶液。在0°C到室温下,加入催化量的Cu(II)盐,然后加入
烯丙基卤化物或
甲磺酸酯,可以高收率得到S N 2 '产物。还报道了合成(E)-
烯烃二肽等排体的应用。