Radical Ring Closures of 4-Isocyanato Carbon-Centered Radicals
作者:Patricia L. Minin、John C. Walton
DOI:10.1021/jo034002o
日期:2003.4.1
The 2-(2-isocyanatophenyl)ethyl radical was generated from the corresponding bromide with tributyltin and tris(trimethylsilyl)silyl radicals and shown to ring close in the 6-endo-mode to afford 3,4-dihydro-1H-quinolin-2-one as the major product. Cyclization in the 5-exo-mode to produce 2,3-dihydroindole-1-carbaldehyde, after hydrogen abstraction, was a minor reaction. Rate constants for the two processes
This invention relates to 4-(2-pyrimidinyl)-1-piperazinyl heterocyclic carbonyl derivatives, to a process for their preparation, and to their use as anxiolytic agents.
The synthesis of ring-fused thienopyrimidinedione derivatives is described. The novel ring-fused thienopyrimidinedione derivatives are generally vasodilating agents and antihypertensive agents and as such are useful as cardiovascular agents.
Thieno- and furopyrimidine-2,4-dione piperidine derivatives as serotonin
申请人:Ortho Pharmaceutical Corporation
公开号:US04835157A1
公开(公告)日:1989-05-30
Novel thienopyrimidine-2,4-dione piperidine derivatives and novel furo[3,4-d]pyrimidine-2,4-dione piperidine derivatives are described. The novel piperidine derivatives are selective serotonin antagonists and alpha adrenergic blocking agents with cardiovascular, gastrointestinal and central nervous system activites.
With ω-halogenoalkyl isocyanates, 2-oxocyclododecane-l-carbonitrile is transformed under ring enlargement to 1-(ω-halogenoalkyl)-2,14-dioxo-1-azacyclotetradecane-3-carbonitriles. In the presence of base, these products undergo O- or C-alkylation leading to bicyclic compounds. The C-alkylation product 7 undergoes solvolysis to form a sixteen-membered ring compound.