flexible synthetic approach to [bis(tert-butoxycarbonyl)amino]propyl}piperidines 5 and related compounds is described. The key step is a three-component coupling process of 2-, 3- or 4-bromopyridine, propargyl bromide and potassium di-tert-butyliminodicarbonate under palladium–copper catalysis leading to 2-, 3- or 4-[bis(tert-butoxycarbonyl)amino]-propargyl}pyridines 4 followed by a catalytic reduction
描述了一种双(叔-丁氧基羰基)
氨基]丙基}
哌啶5和相关化合物的快速而灵活的合成方法。关键步骤是
钯,
铜催化下2-,3-或4-
溴吡啶,炔丙基
溴和二叔丁基亚
氨基二
碳酸钾的三组分偶联过程,导致2-,3-或4-[bis(tert -丁氧基羰基)
氨基]-炔丙基}
吡啶4,然后进行催化还原步骤。