Tetrahedron

Synthesis of spiro-pyrazolines: reaction of 1, 3-diphenylnitrilimine with fulvenes

DN Dhar, R Ragunathan

Index: Dhar, D. N.; Ragunathan, R. Tetrahedron, 1984 , vol. 40, # 9 p. 1585 - 1590

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Citation Number: 10

Abstract

A one-step synthesis of a new series of spiro-pyrazolines has been accomplished by the 1, 3- dipolar cycloaddition of 1, 3-diphenylnitrilimine with various fulvenes (2, 3, 4, 5-tetraphenyl fulvene (1) and its analogues (2, 3), 9-benzalfluorene (7) and its analogues (8, 9) and 6, 6- diphenylfluvene (13)). With the exception of 13 all other fulvenes undergo 1, 3-dipolar cycloaddition across the exocyclic double bond to give the hitherto unreported spiro- ...