In(OTf)3-Catalyzed Synthesis of Functionalized 1,5-Benzodiazepines from o-Phenylenediamine and Alkyl Propiolates under Solvent-Free Reaction Conditions
作者:Haisheng Wu、Jin Yang、Lei Wang
DOI:10.1002/cjoc.201180307
日期:2011.8
environmental‐friendly, and practical method for the synthesis of benzodiazepine derivatives through a reaction of substituted o‐phenylenediamines with alkylpropiolates has been developed. The reactions generated the 1,5‐benzodiazepines in good to excellent yields in the presence of catalytic amount of In(OTf)3 under solvent‐free reactionconditions.
Gallium(III) triflate-catalyzed [4+2+1] cycloaddition of o-phenylenediamines and 2 equiv of alkynoate under solvent-free and ultrasonic irradiation conditions afforded novel 3,4-disubstituted-1,5-benzodiazepines in 82-90% yields. (C) 2009 Elsevier Ltd. All rights reserved.
Regioselective intramolecular annulations of ambident β-enamino esters: A diversity-oriented synthesis of nitrogen-containing privileged molecules
作者:Srinivasarao Yaragorla、Abhishek Pareek
DOI:10.1016/j.tetlet.2018.01.064
日期:2018.3
intramolecular annulation of β-enamino esters is described under solvent-free, calcium-catalysis. 2-aminoaryl ketones and alkylpropiolates undergone a [4+2] annulation to yield substituted quinolines; with an excess of alkylpropiolates, benzodiazepines were formed via a [4+2+1] annulation. We also described a one-pot, 3-component synthesis of quinoline derivatives via a [4+2+2] annulation. Interestingly