Synthesis and lipase catalysed stereoselective acylation of some 3-methylalkan-2-ols, identified as sex pheromone precursors in females of pine sawfly species
作者:Erik Hedenström、Helen Edlund、Susan Lund、Malin Abersten、David Persson
DOI:10.1039/b201395a
日期:——
Several 3-methylalkan-2-ols precursors to sex pheromones of Diprion pini, Gilpinia pallida, Gilpinia frutetorum, Diprion nipponica, Macrodiprion nemoralis and Microdiprion pallipes were synthesised as stereoisomeric mixtures in moderate to good yields. The key reaction sequence in the syntheses was the ring opening of either cis- or racemic trans-epoxybutane using a higher order cyanocuprate as nucleophile followed by a highly efficient lipase catalysed stereoselective acylation of the obtained 3-methylalkan-2-ol. The biologically active species specific stereoisomer was synthesised as a single stereoisomer in high stereoisomeric purity, as one in a mixture of two or as one of four stereoisomers when the appropriate 3-methylalkan-2-ol was stereoselectively acylated using a Pseudomonas sp. lipase as catalyst.
若干3-甲基烯烃-2-醇类化合物是松小蠹属昆虫(如松小蠹、吉尔平小蠹、弗鲁特小蠹、日本小蠹、大小蠹和微小蠹)性信息素的先导化合物,这些化合物作为中等至高产率的立体异构混合物被合成。合成中的关键反应序列是使用高级氰基铜酸盐作为亲核试剂打开环氧丁烷(顺式或外消旋反式)的环,随后通过高效的脂肪酶催化的立体选择性酰化反应获得3-甲基烯烃-2-醇。生物活性物种特异性的立体异构体以高立体异构纯度被合成,作为单一立体异构体、两种混合物中的一种或四种立体异构体之一,这是通过使用假单胞菌属脂肪酶作为催化剂对适当的3-甲基烯烃-2-醇进行立体选择性酰化反应实现的。