Synthesis of a branched-chain inosose derivative, a versatile synthon of N-substituted valiolamine derivatives from D-glucose
摘要:
The synthesis of (1S)-(1(OH)-2,4/1,3)-2,3,4-tri-O-benzyl-1-C-[(benzyloxy)methyl]-5-oxo-1,2,3,4-cyclohexanetetrol (7), which is an important synthon for the synthesis of valiolamine (8) 2 and its N-substituted derivatives such as AO-128 (9)3 having strong alpha-D-glucosidase inhibitory activity, is described. This branched-chain inosose derivative 7 has been prepared from the D-glucono-1,5-lactone derivative 2 which is readily available from D-glucose (1). The key step in the synthesis involves the stereospecific intramolecular carbocyclic ring, closure of the 1-deoxy-2, 6-heptodiulose derivatives 5a and 5b obtained by the oxidation of 2,3,4,6-tetra-O-benzyl-1-C-[bis-(methylthio)methyl]-D-glucitol (4a) and 2,3,4,6-tetra-O-benzyl-1-C-(dichloromethyl)-D-glucitol (4b). The resulting branched-chain bis(methylthio)inosose derivative 6a and dichloroinosose derivative 6b have been converted to the desired branched-chain inosose derivative 7 by desulfurization of 6a and dechlorination of 6b.
[EN] PROCESS FOR THE PREPARATION OF 1,2,3,4-CYCLOHEXANETETROL DERIVATIVES<br/>[FR] PROCEDE POUR LA PREPARATION DE DERIVES DE 1,2,3,4-CYCLOHEXANETETROL
申请人:RANBAXY LAB LTD
公开号:WO2005049547A1
公开(公告)日:2005-06-02
Provided herein are processes for the preparation of 1,2,3,4-cyclohexanetetrol derivatives, which are useful intermediates for the synthesis of voglibose; processes for the preparation of substituted 2,3,4,5-tetrahydroxycyclohexanone; and processes for preparing voglibose. Also provided are compounds formed by such processes.