作者:Donogh J.R. O'Mahony、Russell J. Johnson、M. Angels Estiarte、William T. Edwards、Matthew A.J. Duncton
DOI:10.1016/j.tetlet.2019.151229
日期:2019.11
A reliable three-step synthesis of ortho-substituted 4-pyrazolyl-2-ethylamines starting from a pyrazole methyl ketone and N-tert-butanesulfinylamine is described. Strongly dehydrating conditions were required to form the N-tert-butanesulfinyl ketimines, but these intermediates were stable to aqueous work-up and chromatography. Reduction of N-tert-butanesulfinyl ketimines with L-selectride®, or Super-hydride®
的可靠的三步合成邻-取代的4-吡唑基-2-乙基胺从吡唑甲基酮开始和ñ -叔描述-butanesulfinylamine。强烈需要进行脱水的条件来形成Ñ -叔-butanesulfinyl酮亚胺,但是这些中间体是稳定的,以含水后处理和色谱法。的还原Ñ -叔在THF中与L-selectride®或Super-hydride®一起使用-丁烷亚磺酰基酮亚胺可提供优异的亚磺酰胺收率和非对映选择性,并用HCl甲醇转化为手性胺。这些研究中的4-吡唑基-2-乙基胺是药物化学家的有吸引力的构成部分,因为它们显示出低分子量和低计算辛醇-水分配系数(cLog P值),同时破坏了具有三维特征的平面度。例如,胺产物被用于人类瞬时受体电位类香草素1(TRPV1 / VR1)的结构活性研究。