Synthesis and Evaluation of New 1,7-Dioxaspiro[5.5]undecane Ligands: Implications for the Use of Diols in the Desymmetrization of meso Epoxides
作者:Debasis Patra、Lihua Yang、Nancy I. Totah
DOI:10.1016/s0040-4020(99)01044-3
日期:2000.1
The synthesis and preliminary evaluation of two new chiral 1,7-dioxaspiro[5.5]undecane ligands is described. The compounds of interest are readily available in enantiomerically pure form. Chiral organotitanium complexes prepared from these ligands catalyze the ring opening reaction of meso epoxides by TMSN3. A key observation suggests that silylation of the ligand competes with catalyst turnover in