1,5-Benzoxathiepin derivatives. I. Synthesis and reaction of 1,5-benzoxathiepin derivatives.
作者:HIROSADA SUGIHARA、HIROSHI MABUCHI、YUTAKA KAWAMATSU
DOI:10.1248/cpb.35.1919
日期:——
Methyl 3-oxo-3, 4-dihydro-2H-1, 5-benzoxathiepin-4-carboxylates (3a-f) were synthesized by regioselective Dieckmann reaction of methyl 2-methoxycarbonylmethylthiophenoxyacetates (2a-f) [readily prepared from 2-mercaptophenols (la-f)] in fairly good yields. Alkylation of thc ketoester (3b) with alkyl halides gave 4-alkylated derivatives (7 and 8). A substituent at the 2-position on the 1, 5-benzoxathiepin ring was introduced by Dieckmann reaction of methyl ssubstituted 2-methoxycarbonylmethylthiophenoxyacetates (11, 12b and 12f). Thorpe-Ziegler reaction of 2-cyanomethylthiophenoxyacetonitriles (18a-d) gave 3-amino-2H-1, 5-benzoxathiepin-4-carbonitriles (19a-d). Novel heterocycles, 4-amino-11H-pyrimido [4, 5-c] [1, 5] benzoxathiepin derivatives (24-32), were synthesized by the reaction of enaminonitriles (3a and 3b) with amidines or guanidines.
甲基3-氧基-3, 4-二氢-2H-1, 5-苯并噻噁烯-4-羧酸酯(3a-f)通过区域选择性的Dieckmann反应合成,起始物为甲基2-甲氧基羧基甲基噻吩氧乙酸酯(2a-f,易于由2-巯基苯酚(1a-f)制备而成),产率相当不错。对酮酸酯(3b)进行烷基化反应,使用烷基卤化物得到了4-烷基化衍生物(7和8)。通过对甲基取代的2-甲氧基羧基甲基噻吩氧乙酸酯(11, 12b和12f)进行Dieckmann反应,实现了在1, 5-苯并噻噁烯环的2位引入取代基。对2-氰甲基噻吩氧乙腈(18a-d)进行Thorpe-Ziegler反应,得到3-胺基-2H-1, 5-苯并噻噁烯-4-氰基(19a-d)。通过酰胺腈(3a和3b)与酰胺或胍反应,合成了新型杂环化合物4-氨基-11H-吡咯并[4, 5-c][1, 5]苯并噻噁烯衍生物(24-32)。