Diels-alder cyclization of 2,8,10-undecatrienals as a route to 1,2,3,4,4a,5,6,8a-octahydronaphthalenes
作者:James A. Marshall、James E. Audia、Jonathan Grote、Barry G. Shearer
DOI:10.1016/s0040-4020(01)90578-2
日期:1986.1
2,8,10-Undecatrienals have been found to undergo facile Diels-Alder cyclization upon treatment with alkylaluminum chlorides in methylene chloride at low temperature. The reaction is highly endo-selective. Protected alcohol substituents at the C-4 and C-7 positions are fully accommodated and TBDMS protected alcohols show a strong axial preference. The methodology has been applied to a hydronaphthalenecarboxylic
已经发现,在低温下用烷基铝氯化物在二氯甲烷中处理后,有2,8,10-脱十环烯类容易地发生Diels-Alder环化反应。该反应是高度内切选择性的。完全适应了C-4和C-7位的受保护醇取代基,而TBDMS保护的醇显示出较强的轴向偏爱性。该方法已应用于可能在大环抗肿瘤抗生素氯环硫内酯的预期总合成中使用的氢化萘羧酸。