The optically pure 6-(4-alkyl-4,5-dihydro-1,3-oxazol-2-yl)pyridine-2-carboxylates have been prepared from 6-methoxycarbonylpyridine-2-carboxylic acid by a sequence of three reactions with the overall yield of 40–50%. Some of these compounds form stable complexes with Cu(II) ions in non-aqueous medium. Their polymeric structure was determined in the solid phase by X-ray diffraction analysis. The Cu(II) complexes were also used as catalysts for addition reactions of terminal alkynes to imines giving substituted propargylamines with maximum yield 64% and 37% ee.
光学纯的6-(4-烷基-4,5-二氢-1,3-
噁唑-2-基)pyridine-2-
羧酸酯是通过一系列三步反应,从6-甲氧基羰基
吡啶-2-
羧酸中合成的,整体产率为40-50%。其中一些化合物在非
水介质中与Cu(II)离子形成稳定的络合物。其聚合结构通过X射线衍射分析在固相中确定。Cu(II)络合物还被用作催化剂,促进末端
炔烃与
亚胺的加成反应,得到取代的
丙炔胺,最大产率为64%,光学纯度为37%ee。