Reactions of chiral 2-p-tolylsulfinycycloalkanones with AlMe3
摘要:
The reactions of (S2,Rs) and (R2,Rs)-2-p-tolylsulfinylcyclohexanones with AlMe3/ZnCl2 only yield the cyclohexylmethylcarbinols with R configuration at hydroxylic carbon. The (R1,S2,Rs)-1-methyl-2-p-tolylsulfinylcyclopentanol was the only compound obtained in the reaction of Me3Al with both epimeric 2-p-tolylsulfinylcyclopentanones. The d.e. of both reactions are higher than 96%.
Stereoselective hydride reductions of chiral 2-p-tolylsulfinylcycloalkanones
作者:Ana B. Bueno、M. Carmen Carreño、Jose L. García Ruano、Begoña Peña、Almudena Rubio、Miguel A. Hoyos
DOI:10.1016/s0040-4020(01)85512-5
日期:——
The highly stereoselective hydride reductions of chiral 2-p-tolylsulfinyl-cyclopentanones and cycloheptanones are described. With DIBAL (electrophilic hydride) the configuration induced at C-1 is controlled by the sulfinyl group (1,3-asymmetric induction), and it can be inverted by using ZnCl2 as catalyst. With L-selectride the stereoselectivity is directed by the C-2 chiral groups (1,2-asymmetric induction). Other nucleophilic hydrides gave results which depend on the reagents and the size of the rings.
CARMEN, CARRENO M.;GARCIA, RUANO JOSE L.;PEDREGAL, CONCEPCION;RUBIO, ALMU+, J. CHEM. SOC. PERKIN TRANS. PT 1,(1989) N, C. 1335-1337
作者:CARMEN, CARRENO M.、GARCIA, RUANO JOSE L.、PEDREGAL, CONCEPCION、RUBIO, ALMU+