[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF 3,4-DIHYDRO-1,4-BENZOTHIAZINE<br/>[FR] PROCEDE AMELIORE DE PREPARATION DE 3,4-DIHYDRO-1,4-BENZOTHIAZINE
申请人:REDDY RESEARCH FOUNDATION
公开号:WO2002020498A2
公开(公告)日:2002-03-14
A process for the preparation of 3,4-dihydro-1,4-benozthiazine of the formula (1) which comprises, condensing of 2-aminothiophenol with dihaloethane of formula (11) wherein X represents halogen atom in presence of organic base and relatively non polar solvent at a temperature in the range of 40-80 °C followed by cyclization and formation of organic salt as by product and isolating the compound of formula (1) by conventional methods.
[EN] PROCESS FOR THE PREPARATION OF 2-[3,4-DIHYDRO-1,4-BENZOTHIAZIN-4-YL]ETHYLMETHANE SULPHONATE<br/>[FR] PROCEDE DE PREPARATION DE 2-[3,4-DIHYDRO-1,4-BENZOTHIAZIN-4-YL]ETHYLMETHANE SULPHONATE
申请人:REDDY RESEARCH FOUNDATION
公开号:WO2002020499A1
公开(公告)日:2002-03-14
A process for the preparation of 2-[3,4-dihydro-1,4-benzothiazin-4-yl]ethylmethane sulphonate of formula (1) which comprises reducing the N-alkylated benzothiazine of the formula (7) where R is hydrogen or ethyl at a temperature in the range of 10 - 70 °C or N-alkylating the 3,4-dihydro-1,4-benzothiazine with 2-haloethanol at a temperature in the range of 110-220 °C, in the presence of a base to get 2-[3,4-dihydro-1,4-benzothiazin-4-yl]ethanol, mesylating the 2-[3,4-dihydro-1,4-benzothiazin-4-yl]-1-ethanol to a compound of formula (1) by treating with methane sulphonyl chloride in the presence of an organic base and an organic solvent and isolating the compound of formula (1) by conventional methods.
[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF BICYCLIC ANTIDIABETIC COMPOUNDS<br/>[FR] PROCEDE AMELIORE DE PREPARATION DE COMPOSES ANTIDIABETIQUES BICYCLIQUES
申请人:REDDYS LAB LTD DR
公开号:WO2003024944A1
公开(公告)日:2003-03-27
The present invention relates to an improved process for the preparation of antidiabetic compounds having the formula (1), where R1 represents (C¿1?-C6)alkyl group, X represents sulphur or oxygen atom.