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
The invention is concerned with novel N-(4-carbamimidoyl-phenyl)-glycine derivatives of the formula:
1
wherein R
1
, E, X
1
to X
4
and G
1
and G
2
are as defined in the description and the claims, as well as hydrates or solvates and physiologically usable salts thereof.
The invention is concerned with novel N-(4-carbamimidoyl-phenyl)-glycine derivatives of the formula:
wherein R1, E, X1 to X4 and G1 and G2 are as defined in the description and the claims, as well as hydrates or solvates and physiologically usable salts thereof.
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.