Thermolysis of a spiro-fused oxadiazoline: The carbonyl ylidecyclic carbenediradical sequence
作者:Nadine Merkley、John Warkentin
DOI:10.1139/v02-126
日期:2002.9.1
Thermolysis of spiro-fused oxadiazoline 1 in benzene led to loss of N2 to form a carbonyl ylide intermediate. Most of the ylide fragmented to acetone and 4-phenyl-1,3-dioxane-2-ylidene, which could be trapped with tert-butyl alcohol. In the absence of the trapping agent, the major pathway followed by the carbene was fragmentation to a diradical, 5-phenyl-2-oxa-1-oxo-1,5-pentanediyl. The latter diradical
苯中的螺稠合恶二唑啉 1 的热解导致 N2 损失,形成羰基叶立德中间体。大多数叶立德裂解为丙酮和 4-苯基-1,3-二恶烷-2-亚基,它们可以被叔丁醇捕获。在没有捕集剂的情况下,卡宾遵循的主要途径是裂解成双自由基 5-苯基-2-氧杂-1-氧-1,5-戊二基。后者的双自由基与 α-苯基-γ-丁内酯偶联并脱羧得到环丙苯。来自反应的其他产物是卡宾明显插入苯溶剂的 CH 键和丙酮的 CH 键的产物。这样的反应似乎史无前例??提出了替代的非卡宾机制。关键词:二恶卡宾,羰基叶立德,环丙苯,双自由基,内酯,恶二唑啉。