N-hydroxypyridine-2 (1H)-thione derivatives of carboxylic acids as activated esters. Part I. The synthesis of carboxamides

~97%

~%

~%

~73%

~93%

~95%

~%

~76%

~73%

~%

~%

~99%

~96%

~94%

~97%

~%

~78%

~%

~77%

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~97%

~90%

~96%