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Communication | Special issue | Vol 7, No. 2, 1977, pp.907-912
Published online, 1st January, 1970
DOI: 10.3987/S-1977-02-0907
Reaction of 1,2-Diphenyl-1-azaspiro[2.2]pentane with C,N-Diphenylnitrone

Otohiko Tsuge* and Hiroyuki Watanabe

*Research Institute of Industrial Science, Faculty of Engineering, Kyushu University, 6-1, Kasuga-koen, Kasuga 816-8580, Japan


The reaction of 1,2-diphenyl-1-azaspiro[2.2]pentane (1) with C,N-diphenylnitrone (2) has been investigated under various con- ditions. Azaspiropentane 1 reacts with 5 to give the 1:1 adduct 3, tetrahydro-1H-1,3-benzodiazepin-4-one compound 4, and/or its ring opening isomer 5, whose relative yields depended on the nature of solvents employed. The reaction pathways are also described.