investigated. With 2 equiv of base, the dichloro-β-lactam derivatives underwent rearrangement and dihydro-1,4-benzothiazepines, 3,4-substituted isoquinolines and substituted thiazole disulfides were isolated. A possible reaction mechanism is proposed for the simultaneous formation of the novel products. The formation of isoquinoline and thiazole derivatives can be explained by sulfur extrusion and addition
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