Osmium Hydride Acetylacetonate Complexes and Their Application in Acceptorless Dehydrogenative Coupling of Alcohols and Amines and for the Dehydrogenation of Cyclic Amines
作者:Miguel A. Esteruelas、Virginia Lezáun、Antonio Martínez、Montserrat Oliván、Enrique Oñate
DOI:10.1021/acs.organomet.7b00521
日期:2017.8.14
presence of 5 mol % of KOH, complexes 3–6 promote the coupling of benzyl alcohol and aniline to give N-benzylideneaniline and H2. Under the same conditions, complex 3 catalyzes a wide range of analogous couplings to afford a variety of imines, including aliphatic imines, with yields between 90 and 40% after 1–48 h. Complex 3 also catalyzes the dehydrogenation of cyclic amines. According to the amount
从OsH 6(P i Pr 3)2(1)和OsH 2 Cl 2(P i Pr 3)2(2)开始制备新的氢化配合物,以及它们在醇和胺的无受体脱氢偶联中的催化活性并报道了环胺的脱氢。配合物1与乙酰丙酮(Hacac)反应,得到经典的三氢化物OsH 3(acac)(P i Pr 3)2(3)。3的质子化用三氟甲磺酸(HOTf)产生H 2的释放并形成不饱和二氢os(IV)[OsH 2(acac)(P i Pr 3)2 ] OTf(4),也可以从2开始通过中间体OsH 2 Cl(acac)(P i Pr 3)2(5)。用KOH处理5的乙酰丙酮溶液,得到Os(acac)2(P i Pr 3)2(6)。在5摩尔%的KOH存在下,络合物3– 6促进苄醇和苯胺的偶联,得到N-苄叉基苯胺和H 2。在相同条件下,配合物3催化多种类似的偶合反应,从而提供各种亚胺,包括脂肪族亚胺,在1–48小时后收率在90%至40%