A new bromoform reaction of tertiary amines with N,N-dibromosulfonamides or NBS/sulfonamides has been developed. A series of amidines were prepared with moderate to good yields via a Csp(3)-Csp(3) bond cleavage.
Unprecedented 1,3-<i>tert</i>-butyl migration <i>via</i> the C–N single bond scission of isonitrile: an expedient metal-free route to <i>N</i>-sulfonyl amidines
isonitrile with N,N-dibromoaryl sulfonamides and nitrile. The reaction involves the simultaneous C–N single bond scission of isonitrile and the migration of the tert-alkyl group to the adjacent unsaturated nitrogen centre of the nitrile precursor, which eventually results in the formation of N-sulfonyl amidine. This method constitutes a new route for sulfonyl amidine, which does not rely on transition metals
A Unified Approach for the Synthesis of Isourea and Isothiourea from Isonitrile and <i>N,N</i>-Dibromoarylsulfonamides
作者:Debashish Mishra、Prodeep Phukan
DOI:10.1021/acs.joc.1c01578
日期:2021.12.17
for the synthesis of both isourea and isothiourea in a three-component coupling reaction by treating alcohols or thiols respectively with N,N-dibromoarylsulfonamides and isonitrile and in the presence of K2CO3. This metal-free process proceeds via carbodiimide intermediate at room temperature within a very short reaction time. A library of sulfonylisoureas and isothioureas has been made using this synthetic
已经开发了一种在三组分偶联反应中合成异脲和异硫脲的统一方法,方法是分别用N,N-二溴芳基磺酰胺和异腈在 K 2 CO 3存在下处理醇或硫醇。这种无金属工艺在室温下通过碳二亚胺中间体在非常短的反应时间内进行。使用这种合成方案制备了磺酰异脲和异硫脲库,具有广泛的底物范围,产率从好到高。
Facile, catalyst-free cascade synthesis of sulfonyl guanidines<i>via</i>carbodiimide coupling with amines
An expeditious catalyst-free cascade coupling of N,N-dibromoarylsulfonamides with isonitriles and amines via carbodiimide intermediates has been developed. The protocol represents an elegant pathway for sulfonyl guanidines at room temperature within a short time with high yields and wide substrate scope. The carbodiimide intermediate could also be isolated in an appreciable yield.
Cascade Synthesis of 5-Aminotetrazoles from Isonitriles and <i>N,N</i>-Dibromoarylsulfonamides via Carbodiimide Coupling with Azide
作者:Debashish Mishra、Sauvik Kashyap、Prodeep Phukan
DOI:10.1021/acs.joc.3c00041
日期:2023.7.7
A cascade protocol for the synthesis of aminotetrazoles have been developed by treating isonitriles, N,N-dibromoarylsulfonamides, and sodium azides in the presence of K2CO3. This metal-free process proceeds via an isolable carbodiimide intermediate at room temperature, which could further react with sodium azide and subsequently cyclizes intermolecularly to provide 5-aminotetrazoles within a short
通过在 K 2 CO 3存在下处理异腈、 N,N-二溴芳基磺酰胺和叠氮化钠,开发了用于合成氨基四唑的级联方案。这种无金属过程在室温下通过可分离的碳二亚胺中间体进行,该中间体可以进一步与叠氮化钠反应,随后在短时间内进行分子间环化,生成 5-氨基四唑。本协议的显着成就是底物范围广、产量良好至优异、以及良好的官能团耐受性。