Highly Stereoselective and Efficient Addition of Organocerium Reagents to syn-β-Alkyl-β-hydroxy-α-methyl Ketones by Way of Their Titanium Alkoxides − Synthesis of Complex 1,3-Diol Units with Three Stereodefined Centres
作者:Giuseppe Bartoli、Marcella Bosco、Emanuela Di Martino、Enrico Marcantoni、Letizia Sambri
stereoselective technique for additions to syn-β-alkyl-β-hydroxy-α-methyl ketones is now available. The methodology is based on the conversion of the starting material into a trichlorotitanium alkoxidederivative, which is able to assume a stable cyclic arrangement exhibiting high stereofacial discrimination towards nucleophilic alkyl transfer by an appropriate organometallic species. The use of Grignard