Small-Ring Compounds. XI. Some New Cyclobutane, Cyclobutene and Cyclobutanone Derivatives Derived from the Adduct of Phenylacetylene with 1,1-Difluoro-2,2-dichloroethylene
作者:John D. Roberts、G. Bruce Kline、Howard E. Simmons
DOI:10.1021/ja01115a044
日期:1953.10
The adduct (I) of phenylacetylene and 1,1-difluoro-2,2-dichloroethylene (obtained in 76% yield in 2 hours at 130o) has been shown to be 1,1-difluoro-2,2-dichloro-3-phenylcyclobutene. Hydrogenation of I yielded1,1-difluoro-3-phenylcyclobutane (II), while hydrolysis with concentrated sulfuric acid at 100o gave crystalline 2,2-dichloro-3-phenylcyclobutenone (III). The structure of III was firmly established
Copper-Catalyzed Ring-Opening Defluoroborylation of <i>gem</i>-Difluorinated Cyclobutenes: A General Route to Bifunctional 1,3-Dienes and Their Applications
gem-fluorinated cyclobutenes with bis(pinacolato)diboron (B2pin2). A sequence of defluoroborylation and a ring-opening process produces B,F-bifunctional 1,3-dienes in a stereoselective manner. The transformation together with the efficient downstream coupling of the boronate and the fluoride moieties collectively constitutes a modular route to highly functionalized and stereocontrolled 1,3-dienes.
SUBSTITUTED DIAZEPINE SULFONAMIDES AS BOMBESIN RECEPTOR SUBTYPE-1 MODULATORS
申请人:Baker Robert K.
公开号:US20100317645A1
公开(公告)日:2010-12-16
Certain novel substituted diazepine sulfonamides are ligands of the human bombesin receptor and, in particular, are selective ligands of the human bombesin receptor subtype-3 (BRS-3). They are therefore useful for the treatment, control, or prevention of diseases and disorders responsive to the modulation of BRS-3, such as obesity, and diabetes.