作者:R.M. Coates、R.M. Freidinger
DOI:10.1016/s0040-4020(01)92928-x
日期:1970.1
farnesol to (±)-sesquicarene (1) involving intramolecular carbenoid cycliziation of acyclic precursors as the key step are described. The diazoketone (4) derived from 2,6,10-trimethylundeca-5,9-dienoicacid (14) undergoes efficient copper-catalyzed cyclization to sesquicarone (5). Sesquicarene is obtained by pyrolysis of the sodium salt of the p-toluenesulfonylhydrazone of 5. A direct cyclization of
描述了从法尼醇到(±)-倍半萜烯(1)的两种合成途径,其中涉及无环前体的分子内类胡萝卜素环化是关键步骤。衍生自2,6,10-三甲基undeca-5,9-二烯酸(14)的重氮酮(4)经过有效的铜催化环化生成倍半酮(5)。倍半萜烯是通过对5的对甲苯磺酰基hydr的钠盐进行热解而获得的。法呢醛对甲苯磺酰hydr(17)的直接环化也以低产率得到(±)-1。