Ring transformations of 1,3-benzothiazine derivatives II conversion of 6α-aryl-7α-chloro-2,3(2′,3′-dialkqxybenzo)-1-thiaoctems3 into 2-carbomethoxy-3-aryl-7,8-dialkoxy-4.5-dihydro-1,4-benzothiazepines
作者:Lajos Fodor、János Szabó、Erzsébet Szúcs、Gábor Bernáth、Pál Sohár、József Tamás
DOI:10.1016/0040-4020(84)85090-5
日期:1984.1
6,7-Dialkoxy-2-aryl-4H1-1,3-benzothiazines (1a⇍) react with chloroacetyl chlorlde to give condensed β-lactam derivatives (2a⇍). Basic treatment of 2a⇍ in methanol led to the corresponding 1,4-banzothiazepine derivativee (3a⇍) viaring expansion. The structures of the products were determined by IR, NMR and MS studies