β-(Cycloalkylamino)ethanesulfonyl azides as novel water-soluble reagents for the synthesis of diazo compounds and heterocycles
作者:Yuri M. Shafran、Pavel S. Silaichev、Vasiliy A. Bakulev
DOI:10.1007/s10593-019-02609-z
日期:2019.12
water-soluble sulfonyl azides were synthesized, which are basic by nature. The obtained compounds were used as donors of the diazo group in the diazotransfer reaction. Due to their good solubility in water and high polarity, the byproducts formed in this case were easily separated from the desired products by washing with water or column chromatography. It was also shown that new sulfonyl azides as a result
Tandem Cycloaddition of Azides to 3,3-Diaminoacrylonitriles (2-Cyanoacetamidines) and Cornforth-Type Rearrangement as an Approach to 5-Amino-1,2,3-triazole-4-<i>N</i>-substituted Imidamides
作者:Pavel S. Silaichev、Tetyana V. Beryozkina、Vladimir Ilkin、Mikhail S. Novikov、Wim Dehaen、Vasiliy A. Bakulev
DOI:10.1021/acs.joc.3c00151
日期:2023.7.7
base and N-mono- or N,N′-disubstituted 3,3-diaminoacrylonitriles. The reaction is tolerant to variously N-monosubstituted and N,N′-disubstituted 3,3-diaminoacrylonitriles and to various aryl- and aryl/alkyl sulfonyl azides. The developed method has a broad scope and can be applied to obtain a variety of 5-amino-1,2,3-triazole-4-carbimidamides bearing at the N1 position alkyl, allyl, propargyl, benzyl
Cycloaddition reactions of heterocyclic azides with 2-cyanoacetamidines as a new route to <i>C</i>,<i>N</i>-diheteroarylcarbamidines
作者:Pavel S Silaichev、Tetyana V Beryozkina、Vsevolod V Melekhin、Valeriy O Filimonov、Andrey N Maslivets、Vladimir G Ilkin、Wim Dehaen、Vasiliy A Bakulev
DOI:10.3762/bjoc.20.3
日期:——
either an additional pyrimidinedione, 4-nitroimidazole, isoxazole, 1,3,4-triazole, 2-oxochromone or thiazole ring, has been developed. The process was facilitated by a strong base and includes the cycloaddition reaction of 3,3-diaminoacrylonitriles (2-cyanoacetamidines) to heterocyclic azides followed by a Cornforth-type rearrangement to the final products. The reaction is tolerant to various N-monosubstituted