Structure of silylated sulphonamides; a silicon-29 nuclear magnetic resonance investigation
作者:Jim Iley、Alan R. Bassindale、Pravin Patel
DOI:10.1039/p29840000077
日期:——
The structures of eighteen silylsulphonamides have been determined by 29Si n.m.r. The chemical shifts of the compounds were compared with those of model compounds. The N-silyl tautomer was the only isomer observed, except in cases were strongly electron-withdrawing groups (e.g. Cl, NMe2) were attached to nitrogen; in such cases the O-silyl tautomer dominates. The results have been rationalised in terms
通过29 Si nmr确定了18种甲硅烷基磺酰胺的结构。将化合物的化学位移与模型化合物的化学位移进行了比较。的Ñ -甲硅烷基互变异构体是唯一的异构体观察到,除了在例强烈吸电子基团(例如氯,NME。2)被连接到氮; 在这种情况下,O-甲硅烷基互变异构体占主导。根据取代基对S–Nπ键顺序的影响,已对结果进行了合理化。迄今未测出的S N摩尔键焓估计为325 kJ mol –1。
Practical synthesis and biological screening of sulfonyl hydrazides
作者:João Macara、Catarina Caldeira、José Cunha、Jaime A. S. Coelho、Maria J. S. A. Silva、Konrad Krämer、Christoph W. Grathwol、Stefan Bräse、M. Manuel B. Marques
DOI:10.1039/d2ob02160a
日期:——
synthesis of sulfonyl hydrazides mediated by hypervalent iodine is described. Taking advantage of the umpolung properties of hypervalent iodine reagents, the polarity of sodium sulfinate salts is reversed, and a key intermediate is generated and reacted with mono- and disubstituted hydrazines. To highlight the practical utility of this protocol, a diverse range of sulfonyl hydrazides were synthesized in