(3S,5S,6S)-Tetrahydro-6-isopropyl-3,5-dimethylpyran-2-one, a C5-epimer of a component of the natural sex pheromone of the wasp Macrocentrus grandii, the larval parasitoid of the European corn borer Ostrinia nubilalis, was synthesized starting from methyl l-valinate. The transformation includes a Kulinkovich cyclopropanation reaction, a cationic cyclopropyl-allyl rearrangement of cyclopropyl methanesulfonate
(3 S,5 S,6 S)-四氢-6-异丙基-3,5-二甲基
吡喃-2-一,黄蜂Macrocentrus grandii的自然性信息素成分的C 5顶基,其幼虫寄生于欧洲玉米bore虫Ostrinia nubilalis是从
L-缬氨酸甲酯开始合成的。转化包括Kulinkovich
环丙烷化反应,环丙基
甲磺酸盐的阳离子环丙基烯丙基重排,Oppolzer's(N-丙酰基)-(2 R)-
冰片烷10,2-sultam的非对映选择性烷基化以及使用Wilkinson催化剂作为催化剂的非对映选择性氢化关键步骤。