作者:Iman Aly Gad El-Karim、Ray Jone、William B. Motherwell、Henry S. Rzepa、David J. Williams
DOI:10.1016/s0040-4020(01)86746-6
日期:1988.1
reaction formally involves an unusual type of Ene reaction between 2-methylpropenal and the allylic alkoxide anion in which stepwise or highly asynchronous hydride transfer precedes carbon carbon bond formation. Under different reactions conditions the condensation of 2-methylpropenal with the potassium alkoxide of 2-methyl-2-propen-1-ol proceeds to give the bicyclic lactone, 6-endo-hydroxy-7-exo-(2-methyl
已经开发了使2-甲基-2-丙烯-1-醇的烷醇钾自反应生成3,5,5,-三甲基四氢吡喃-2-醇(7)的最佳条件。证据表明该反应中关键的碳碳键形成步骤正式涉及2-甲基丙烯醛与烯丙基醇盐阴离子之间的不寻常类型的Ene反应,其中逐步或高度异步的氢化物转移先于碳碳键形成。在不同的反应条件下,将2-甲基丙烯醛与2-甲基-2-丙烯-1-醇的烷氧基钾缩合,得到双环内酯,6-内-羟基-7-外-(2-甲基烯丙氧基甲基)-报道了其晶体结构的3-氧杂-1,5,7-三甲基双环[3,3,1]壬二-2-(11)。