Synthesis of spiro-pyrazolines: reaction of 1,3-diphenylnitrilimine with fulvenes
作者:D.N. Dhar、R. Ragunathan
DOI:10.1016/s0040-4020(01)91808-3
日期:1984.1
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
Construction of polysubstituted pentafulvenes <i>via</i> palladium-catalyzed deacetylation of enones
作者:Ling-Jun Li、Xing Wang、Hui Xu、Hui-Xiong Dai
DOI:10.1039/d2cc06644k
日期:——
Herein, we report an efficient synthetic method for polysubstituted pentafulvenes via palladium-catalyzed deacetylative [2+2+1] annulation of enones with alkynes. Aryl-, alkenyl-, and alkyl-substituted α,β-enones were suitable substrates, affording the pentafulvene products in moderate to good yields. This protocol shows excellent compatibility with sensitive halides, free hydroxyl groups, and heterocycles