A Novel Synthesis of Sex Pheromone from the Longicorn Beetle
(Psacothea hilaris)
作者:Guo-Guo He、Bao-Qi Rao、Tao Zhang、Hong-Li Zhang、Hongjin Bai、Zhen-Ting Du
DOI:10.1134/s1070428021030180
日期:2021.3
Abstract An asymmetric synthesis of (8Z,21R)-21-methylpentatriacont-8-ene, the sex pheromone of the yellow-spotted longicorn beetle Psacothea hilaris, has been achieved using Evan’s induction as the key step. Based on the asymmetric methylation product of chiral (R)-4-benzyl-1,3-oxazolidin-2-one, the carbon chain of the target molecule was assembled through a C5+C12+C11+C8 sequence. (2R)-4-(Benzyl
摘要 使用Evan's诱导作为关键步骤,已经实现了不对称合成的(8 Z,21 R)-21-甲基戊三酮-8-烯,该化合物是黄色斑点的长角甲虫Psacothea hilaris的性信息素。基于手性(R)-4-苄基-1,3-恶唑烷-2--2-酮的不对称甲基化产物,靶分子的碳链通过C 5 + C 12 + C 11 + C 8序列组装。(2R)-4-(苯甲氧基)-2-甲基丁-1-醇可以根据Evan的方案从γ-内酯获得,并连接到C 12烷基上。手性甲基仍然是关键部分(97%ee)。经过另一次Wittig反应和催化加氢步骤后,获得了设计的关键中间体(13 R)-13-甲基庚七-1-醇。最后,在氧化和维蒂希反应之后,目标分子的合成以10个线性步骤完成,超高总产率为36.2%。