Cyclopropanation reactions with α, β-epoxy diazomethyl ketones and rearrangement of α, β-epoxy cyclopropyl ketones
作者:F.L.M. Smeets、L. Thijs、B. Zwanenburg
DOI:10.1016/0040-4020(80)80175-x
日期:1980.1
cyclopropanation reactions of α, β-epoxy diazomethyl ketones 1 with olefins using Pd(OAc)2 as catalyst is described. Differently substituted epoxy diazo ketones 1a-1f give with cyclohexene exo-norcarane derivatives. 3, 3-Diphenyloxiranyl-2 diazomethyl ketone 1a reacts with olefins like isobutene, E- and Z- butene-2 to give epoxy cyclopropyl ketones. 3, 3-Diphenyloxiranyl-2 cyclopropyl ketones 2a and 9 undergo two
描述了使用Pd(OAc)2作为催化剂的α,β-环氧重氮甲基酮1与烯烃的环丙烷化反应。不同取代的环氧重氮酮1a - 1f与环己烯外-正-正戊烷衍生物一起生成。3,3-二苯基环氧乙烷基-2-重氮甲基酮1a与烯烃如异丁烯,E-和Z-丁烯-2反应,得到环氧环丙基酮。3、3-二苯基环氧乙烷基-2环丙基酮2a和9以BF 3为催化剂进行两次连续的重排反应。第一步,环氧化物重排为9进行反应,得到β-酮醛10,其在第二步骤中重新排列成烯酸酯12。后者反应很可能仅限于具有季α-C原子的β-酮醛。已经提出了这种异常反应的理由。