Heterocyclically bridged tricyclic β-lactames: A simple synthesis of 1,2,2a,8a-tetrahydro-3-oxa-1-aza-cyclobuta[b]naphthalen-2-ones
摘要:
The tricylic 3,4-bridged beta-lactames 7 and 8 containing a hetero atom as 3-substituent of the azetidin-2-one ring were synthesized by intramolecular radical cyclization using cis-substituted 3-(2-bromo-aryloxy)-azetidine-2-ones 6 as precursors. These precursors were generated by stereospecific acid chloride-imine reaction from the corresponding substituted (2-bromophenoxy)acetic acid chlorides 2 and imine 5.
Efficient Synthesis of 2-Functionalized Benzoxazoles Catalyzed by Copper Iodide
作者:Han Cao、Xue-Jing Liu、Fu-sheng Bie、Peng Yan、Jie Ma、Yi-jun Shi、Ying Han
DOI:10.3987/com-20-14276
日期:——
reported an efficient synthesis of 2-functionalized benzoxazoles in mild condition and excellent yields. The synthetic process includes two steps. The step one contains a reaction of pendent halide formamidine derivatives and 2- aryloxyacetyl chloride generating highly selective (Z)-N-(2-halophenyl)-3-(dime- thyllamino)-2-aryloxyacrylamides, and the step two undergoes copperiodidecatalyzed intramolecular
A facile and efficient Cu(I)-catalyzed one-potsynthesis of 2H-1,4-benzoxazin-3-(4 H)-one derivatives has been developed. The condensation between 2-(o-haloaryloxy)acylchlorides and primaryamines followed by Cu(I)-catalyzed intramolecular C-N bond coupling afforded a variety of 2H-1,4-benzoxazin-3-(4 H)-ones in good to excellent yields. Diversified substitutents on the 4-position could be conveniently
Synthesis of Phosphonobenzocarbacephems by Intramolecular Radical Cyclization of Haloaryl-Substituted β-Lactams
作者:Sarah Van der Jeught、Kurt G. R. Masschelein、Christian V. Stevens
DOI:10.1002/ejoc.200901351
日期:2010.3
A series of benzo-fused tricyclic β-lactams, most of them phosphonobenzocarbacephems, were prepared in a straightforward way starting from phosphonoazadienes. In this paper, the synthetic route including a Staudinger reaction towards the β-lactams, followed by radical ring closing with tributyltin hydride and AIBN, which resulted in the envisaged tricyclic compounds, is reported.