Process for the preparation of benzothiazepines by cyclization with
申请人:Zambon Group S.p.A.
公开号:US05223612A1
公开(公告)日:1993-06-29
Process for the preparation of (2S,3S)-2,3-dihydro-3-hydroxy-2-(4-methoxyphenyl)-1,5-benzothiazepin-4(5H) -one of formula ##STR1## by direct cyclization of the compound of the formula ##STR2## with a catalytic amount of phosphonic acid.