Nitrile Imines and Nitrile Ylides: Rearrangements of Benzonitrile <i>N</i>-Methylimine and Benzonitrile Dimethylmethylide to Azabutadienes, Carbodiimides, and Ketenimines. Chemical Activation in Thermolysis of Azirenes, Tetrazoles, Oxazolones, Isoxazolones, and Oxadiazolones
作者:Didier Bégué、Alain Dargelos、Hans M. Berstermann、Klaus P. Netsch、Pawel Bednarek、Curt Wentrup
DOI:10.1021/jo402667y
日期:2014.2.7
Flash vacuum thermolysis (FVT) of 1-methyl-5-phenyltetrazole (5b), 2-methyl-5-phenyltetrazole (1b), and 3-methyl-5-phenyl-1,3,4-oxadiazol-2(3H)-one (3b) affords the nitrile imine (2b), which rearranges in part to N-methyl-N′-phenylcarbodiimide (7b). Another part of 2b undergoes a 1,4-H shift to the diazabutadiene (13). 13 undergoes two chemically activated decompositions, to benzonitrile and CH2═NH
1-甲基-5-苯基四唑(5b),2-甲基-5-苯基四唑(1b)和3-甲基-5-苯基-1,3,4-恶二唑-2(3 H)的快速真空热解(FVT)) -酮(3b中),得到的腈亚胺(图2b),部分地重新排列其中N-甲基ñ ' - phenylcarbodiimide(图7b)。2b的另一部分发生1,4-H转变为二氮杂丁二烯(13)。13经历了两个化学活化的分解,分别生成苄腈和CH 2 = NH以及苯乙烯和N 2。2,2-二甲基-4-苯基-恶唑-5(2 H的FVT)-(16)在400°C时高收率生成3-甲基-1-苯基-2-氮杂丁二烯(18)。相反,在600°C时3,3-二甲基-2-苯基-1-叠氮烯(21)的FVT或在600°C时4,4-二甲基-3-苯基-异恶唑酮(20)的FVT仅给出azabutadiene(18)由于化学活化分解18到苯乙烯和乙腈。来自叠氮苯(21)的反应路径有两种:一种(路径a)