Synthesis of Secondary Amides from<i>N</i>-Substituted Amidines by Tandem Oxidative Rearrangement and Isocyanate Elimination
作者:Pradip Debnath、Mattijs Baeten、Nicolas Lefèvre、Stijn Van Daele、Bert U. W. Maes
DOI:10.1002/adsc.201400648
日期:2015.1.12
The periodinane reagents are obtained from the commercially available phenyliodine(III) diacetate [PhI(OAc)2, (PIDA)] by ligand exchange with carboxylic acids. The N‐substituted amidine substrates are easily synthesized from readily available nitriles. The method is applicable for secondary amide synthesis, based on both aliphatic and (hetero)aromatic amines, including challenging amides consisting
Sulfated tungstate catalyzed activation of nitriles: addition of amines to nitriles for synthesis of amidines
作者:Sachin D. Veer、Kamlesh V. Katkar、Krishnacharya G. Akamanchi
DOI:10.1016/j.tetlet.2016.07.073
日期:2016.9
the synthesis of amidines by direct nucleophilic addition of amines to nitriles using sulfated tungstate as heterogeneous catalyst is described. Highlight of the method is its applicability for the synthesis of amidines using a wide variety of amines including ammonia as ammonium acetate and nitriles. Catalyst is mildly acidic, stable, easy to prepare and separate from the reaction mass.
Reactivity-Controlled Regioselectivity: A Regiospecific Synthesis of 1,2-Disubstituted Benzimidazoles
作者:Xiaohu Deng、Neelakandha S. Mani
DOI:10.1002/ejoc.200901056
日期:2010.2
combination of N 1 /N 2 chemoselectivity on the amidine and reactivity-controlled X 1 /X 2 chemoselectivity on the 1,2-dihaloarene. This reaction proves to be fairly general for the regiospecificsynthesis of 1,2-substituted benzimidazoles.
Sugasawa; Ohara, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1952, vol. 72, p. 1036
作者:Sugasawa、Ohara
DOI:——
日期:——
NHC-Catalyzed Enantioselective [3 + 3] Annulation to Construct 5,6-Dihydropyrimidin-4-ones
作者:Di Meng、Yangxi Xie、Qiupeng Peng、Jian Wang
DOI:10.1021/acs.orglett.0c02832
日期:2020.10.2
The unprecedented enantioselective NHC-catalyzed [3 + 3] annulation of alpha-bromoenals with amidines via a dual C-N bond formation is described. The protocol allows a rapid preparation of 5,6-dihydropyrimidinones in acceptable yields with good enantioselectivities.