Stereoselective synthesis of new hetero(P, Si, Ge, Sn)cyclic derivatives from zirconium diyne and diene complexes
作者:Maryam Mirza-Aghayan、Rabah Boukherroub、Gabriel Oba、Georges Manuel、Max Koenig
DOI:10.1016/s0022-328x(98)00700-1
日期:1998.8
The dipropargylic derivatives of Si, Ge, P, 1a–c, react with the zirconocene entity ‘Cp2Zr’ and give the intermediate bicyclocomplexes 2a–c characterized by 1H and 31P-NMR. The electrophilic addition of H+, Br2 leads to the corresponding exo dienic metallacyclopentanes 3,4. The cyclozirconation reaction with hetero-diallylic compounds 5a–d gives the metallacyclopentanes 7–15, after reaction with different
Si,Ge,P,1a–c的双炔衍生物与锆茂实体'Cp 2 Zr'反应,生成以1 H和31 P-NMR为特征的中间双环配合物2a-c。所述亲电加成H的+,溴2个通向相应外二烯metallacyclopentanes 3,4。与杂diallylic化合物cyclozirconation反应图5a-d给出了metallacyclopentanes 7-15,具有不同的亲电子试剂如H反应后+,PCL 3,PhPCl 2中,Ph2 PCl或Ph 2 PCl(BH 3),Br 2。二炔的环锆化反应是立体选择性的,并导致E,E-环外二烯,而二烯的环锆化的选择性取决于杂原子上的取代基。