Silica gel-supported sulfuric acid catalyzed synthesis of 1,5-benzodiazepine derivatives
作者:D. Shobha、M. Adharvana Chari、K. Mukkanti、K. H. Ahn
DOI:10.1002/jhet.174
日期:2009.9
Silica gel-supported sulfuricacid has been found to be an efficient catalyst for the synthesis of 1,5-benzodiazepines from o-phenylenediamine and ketones in acetonitrile solvent. This method is simple, effective, and environmentally friendly and gives better yields. Compared to the classical reaction conditions, this new method consistently has the advantage of excellent yields (80–97%) and short
Catalyst-free synthesis of benzodiazepines and benzimidazoles using glycerol as recyclable solvent
作者:Catia S. Radatz、Rodrigo B. Silva、Gelson Perin、Eder J. Lenardão、Raquel G. Jacob、Diego Alves
DOI:10.1016/j.tetlet.2011.05.142
日期:2011.8
We described herein the use of glycerol as solvent in the catalyst-free synthesis of benzodiazepines and benzimidazoles. This simple and efficient method furnishes the corresponding 1-H-1,5-benzodiazepines and 1,2-disubstituted benzimidazoles in good yields by the condensation of o-phenylenediamine with several ketones and aldehydes, respectively. In addition, glycerol can be easily re-utilized for
我们在本文中描述了在无催化剂的苯并二氮杂卓和苯并咪唑的合成中甘油作为溶剂的用途。这种简单而有效的方法通过邻苯二胺分别与几种酮和醛缩合,以高收率提供了相应的1 - H -1,5-苯并二氮杂卓和1,2-二取代的苯并咪唑。另外,甘油可以容易地重新用于进一步的缩合反应多达四次而不会失去活性。
Simultaneous reduction of the nitro group and the azide group in o -nitrophenylazide induced by the TiCl 4 /Sm system: a novel synthesis of 2,3-dihydro-1 H -1,5-benzodiazepines
作者:Weihui Zhong、Yongmin Zhang、Xiaoyuan Chen
DOI:10.1016/s0040-4039(00)01888-8
日期:2001.1
o-Nitrophenylazide was treated with the low-valent titanium reagent derived from the TiCl4/Sm system to produce the intermediate 2 in situ, which was a 'living' double-anion and reacted readily with ketones containing active methyl or methylene groups to afford 2,3-dihydro-1H-1,5-benzodiazepines in moderate to high yields under mild and neutral conditions. (C) 2000 Elsevier Science Ltd. All rights reserved.
Zhong; Zhang; Chen, Journal of Chemical Research - Part S, 2000, # 11, p. 532 - 534
作者:Zhong、Zhang、Chen
DOI:——
日期:——
Ultrasound enhanced synthesis of 1,5-benzodiazepinic heterocyclic rings
作者:Karla P. Guzen、Rodrigo Cella、Hélio A. Stefani
DOI:10.1016/j.tetlet.2006.09.043
日期:2006.11
1,5-Benzodiazepines are synthesized by a reaction of o-phenylenediamines with a diketone or ketones series by ultrasound irradiation in presence of APTS. The condensation occurred in a mild condition with good to excellent yields. (c) 2006 Elsevier Ltd. All rights reserved.