Reaction of alkoxycarbene complexes of tungsten with 1,2-dihydroquinoline: single vs. double hydride transfers to the carbene–carbon: synthesis, X-ray structure and reactivity of a quinolinium ylide complex of tungsten pentacarbonyl
作者:H Rudler、C Alvarez、B Denise、A Parlier、J Vaissermann
DOI:10.1016/s0022-328x(03)00509-6
日期:2003.11
dihydropyridine, 1,2-dihydroquinoline (2), reacts with carbene complex of tungsten (CO)5W(OEt)Ph (3) to give the expected quinolinium complex 4, fully characterized by an X-ray structure. By contrast, under the same conditions complex 7 (CO)5W(OEt)Me led to the alkyltungstate 15 as the result of a double hydride transfer to the carbene–carbon. Complex 15 could be trapped by the enamine of morpholine and cyclohexanone
更稳定的二氢吡啶,1,2-二氢喹啉(2)中,用卡宾络合物钨发生反应(CO)5 W(OET)PH(3),得到预期的喹啉鎓络合物4,完全其特征在于X-射线结构。相比之下,在相同条件下复合物7(CO)5 W(OET)我导致alkyltungstate 15作为双氢化物转移到卡宾碳的结果。配合物15可以被吗啉和环己酮的烯胺截留,得到加成产物14。4中的喹啉可以通过离解机制轻松地与过量的吡啶交换,得到已知的吡啶鎓叶立德络合物5。