Synthesis of Tricyclic Nitrogen-containing Heterocycles by Palladium-catalyzed Cyclization of 2-Alkenyl-N-(o-iodobensoyl)- and 2-Alkenyl-N-(o-iodophenylacetyl)pyrrolidines
作者:Masazumi Ikeda、Susumu Akamatsu、Yasuhiro Kugo、Tatsunori Sato
DOI:10.3987/com-95-s63
日期:——
The palladium-catalyzed cyclization of the 2-alkenyl-N-(o-iodobenzoyl)and 2-alkenyl-N-(o-iodophenylacetyl)pyrrolidines gave the tricyclic nitrogen-containing heterocycles.
Approaches to the Cephalotaxine Skeleton Using an Intramolecular Heck Reaction.
作者:Masazumi IKEDA、Ken-ichi HIROSE、Serry A.A. EL BIALY、Tatsunori SATO、Takayuki YAKURA、Said M.M. BAYOMI
DOI:10.1248/cpb.46.1084
日期:——
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 triphenylphosphine and triethylamine in refluxing acetonitrile, gave the monocyclization 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)acetyl]-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.