A highly stereoselective synthesis of the 1β-methylcarbapenem key intermediate from (R)-3-hydroxybutyric acid
作者:Yuko Kobayashi、Yoshio Ito、Shiro Terashima
DOI:10.1016/s0040-4020(01)80578-0
日期:1992.1
Baeyer-Villiger reaction accompanying novel cleavage of the acetal moiety. The Reformatsky reaction of 6 with sterically crowded 3-(2-bromopropionyl)-2-oxazolidone derivatives readily afforded the title keyintermediate after sequential chemical manipulations.
On the preparation of optically active secondary alcohols from a 1,3-dioxan-4-one: Substitution with organocopper reagents
作者:Stuart L. Schreiber、Jeff Reagan
DOI:10.1016/s0040-4039(00)84686-9
日期:——
Organocopper reagents react with a chiral nonracemic 1,3-dioxan-4-one to afford substitution products with high diastereoselectivity. After treatment of the adducts with potassium t-butoxide, optically active secondary alcohols are obtained.
Studies on the opening of dioxanone and acetal templates and application to the synthesis of 1.alpha.,25-dihydroxyvitamin D2
作者:Juan R. Granja、Luis Castedo、Antonio Mourino
DOI:10.1021/jo00053a024
日期:1993.1
The Lewis-acid-mediated nucleophilic substitution of dioxanone and acetal templates for the construction of 25-hydroxylated side chains of vitamin D2 metabolites and analogs has been studied. As an application a highly stereoselective synthesis of 1alpha,25-dihydroxyvitamin D2 by the dienyne route is described.
SCHREIBER S. L.; REAGAN J., TETRAHEDRON LETT., 27,(1986) N 26, 2945-2948