Stereocontrolled Reduction of 2-(p-Tolylsulfinyl)cycloalkanones under Basic Conditions: π-Facial Selection in Cyclic Systems Directed by a Chiral Side Chain
Synthesis and reduction of chiral sulfinyl cyclohexanones
作者:M.C. Carreño、J.L.García Ruano、A. Rubio
DOI:10.1016/s0040-4039(00)96645-0
日期:1987.1
The reaction of cyclohexanone with (S)-(−)-menthyl-p-toluenesulfinate in the presence of Pri2NMgBr yields a mixture of enantiomerically pure 2-p-tolylsulfinylcyclohexanone diastereoisomers. Their stereoselective reduction to chiral hydroxysulfoxides is also reported.
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.