Chemical and Pharmaceutical Bulletin p. 1084 - 1089 (1998)
Update date:2022-07-31
Topics:
Ikeda, Masazumi
Hirose, Ken-Ichi
El Bialy, Serry A. A.
Sato, Tatsunori
Yakura, Takayuki
Bayomi, Said M. M.
1-[2-(o-Iodophenyl)acetyl]-2-(prop-2-enyl)-2-vinylpyrrolidine (17), upon treatment with palladium(II) acetate [Pd(OAc)2] in the presence of tripheoylphosphine and triethylamine in refluxing acetonitrile, gave the monocylization product 20 as the major product along with a small amount of the tandem cyclization product 21. On the other hand, treatment of the 1-[2- (o-iodophenyl)aeetyl]-1-azaspiro[4.4]non-8-en-7-one (25) with Pd(OAc)2, 1,3- bis-(diphenylphosphino)propane, tributylphosphine, and silver carbonate in boiling N,N-dimethylformamide afforded the cyclized product 27 in 51% yield.
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