react with substituted acetylchlorides to give angularly condensed β -lactams (3a-d, 10, 11). The cis compound 11 was epimerised to the trans derivative 12. From the interaction of 2-phenyl-6,7-dimethoxy-4H-1,3-benzothiazine (7) and α -chloro-phenylacetyl chloride two stereoisomeric β -lactam derivatives (9a, b) were isolated, whereas in the other cases studied the reactions leading to β -lactams proved
New tetracyclic derivatives (3a,b, 5, 8) similar to protoberberines, but containing a lactam structural element and other hetero atoms besides the bridge-head nitrogen in rings B and C, were prepared by cycloaddition of 6,7-dimethoxy-2H-1,3-benzothiazine (1a) with o-substituted aromatic carboxylic acid derivatives (2a,b, 4) and from 4- methyl-6,7-dimethoxy-2H-1,3-benzothiazine (1b) with 3.5-dinitrobenzoyl
6,7-Dimethoxy-2 H -1,3-benzothiazine reacted with dimethylacetylenedicarboxylate in aqueous methanol to give heterocycles with unexpected structures. A mechanism is proposed for the reaction.
6,7-二甲氧基-2 H -1,3-苯并噻嗪在甲醇水溶液中与乙酰二羧酸二甲酯反应,生成具有意外结构的杂环。提出了反应的机理。
Reaction of chromium carbene complexes with imines. Synthesis of .beta.-lactams
作者:Louis S. Hegedus、Michael A. McGuire、Lisa M. Schultze、Yijun Chen、Oren P. Anderson
DOI:10.1021/ja00321a032
日期:1984.5
Marsden, Richard; MacLean, David B.; Fodor, Lajos, Canadian Journal of Chemistry, 1984, vol. 62, p. 2682 - 2685
作者:Marsden, Richard、MacLean, David B.、Fodor, Lajos