Efficient Catalytic, Oxidative Lactonization for the Synthesis of Benzodioxepinones Using Thiazolium-Derived Carbene Catalysts
摘要:
An efficient, oxidative carbene-catalyzed lactonization reaction has been developed. Using thiazolium precatalysts, a variety of benzodioxepinone products are accessible in good to excellent yields under mild and operationally simple conditions The reaction does not require high dilution conditions and proceeds via mild and selective oxidation with azobenzene, which can easily be recovered and reused applying inexpensive FeCl3 as a formal terminal oxidant
Substituted cinnamyl-2,3-dihydrobenzofuran and analogs useful as
申请人:Merck & Co., Inc.
公开号:US04686235A1
公开(公告)日:1987-08-11
Substituted cinnamyl-2,3-dihydrobenzofurans and analogs were prepared from the nucleophlic substitution of a cinnamylhalide with a 2,3-dihydrobenzofuran anion or an analog thereof. These compounds were found to be potent topical anti-inflammatory agents.
Substituted 2-(heteroaryl-2-propenyl)phenols useful as anti-inflammatory
申请人:Merck & Co., Inc.
公开号:US04778818A1
公开(公告)日:1988-10-18
Substituted cinnamyl-2,3-dihydrobenzofurans and analogs were prepared from the nucleophlic substitution of a cinnamylhalide with a 2,3-dihydrobenzofuran anion or an analog thereof. These compounds were found to be potent topical anti-inflammatory agents.
N-Heterocyclic Carbene Catalyzed Nucleophilic Substitution Reaction for Construction of Benzopyrones and Benzofuranones
作者:Jinmei He、Jiyue Zheng、Jian Liu、Xuegong She、Xinfu Pan
DOI:10.1021/ol061924f
日期:2006.9.1
N-Heterocyclic carbene as an efficient organic catalyst was employed to catalyze an intramolecular nucleophilic substitution reaction. When R-2 was a phenyl group, the cyclization process underwent isomerization, leading to generation of benzofuranone.