在锡介导的烯丙基化的研究中,一些锡(II)物质,包括锡(II)卤化物、酰胺、丙酮化物和醇盐,已被证明在苯甲醛存在下会发生烯丙基卤化物的氧化加成,生成相应的高烯丙醇。描述了手性醇锡(II)二乙基酒石酸锡(II)的第一种制备方法;其119 Sn NMR 谱在高场显示出两个信号,与反式二聚体结构一致。这种新试剂在苯甲醛存在下与 1,3-氯碘丙烯发生氧化加成反应,得到具有光学活性的苯基乙烯基环氧乙烷;这代表了首次从醛对映选择性制备顺式和反式乙烯基环氧乙烷。
Tuning the reactivity of organotin(IV) by LiOH: allylation and propargylation of epoxides via redox transmetalation
摘要:
In presence of catalytic Pd(0) or Pt(II), a reagent combination of SnCl2-LiOH promotes the reaction of organic halides and epoxides in dichloromethane leading to the regioselective formation of corresponding homoallyl and homopropargyl alcohols in good yields. This 2-carbon extension strategy adds to the repertoire of Barbier reactions via metal salts and reinforces views on the enhanced reactivity of organotin having -OH pendant. (c) 2004 Elsevier B.V. All rights reserved.