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
Reactions of 1,3-benzothiazines and 1,4-benzothiazepines with dimethyl acetylenedicarboxylate
作者:Lajos Fodor、Péter Csomós、Gábor Bernáth、Pál Sohár、Tamás Holczbauer、Alajos Kálmán
DOI:10.1007/s00706-010-0269-5
日期:2010.4
AbstractSubstituted 2H-1,3-benzothiazines and 2,3-dihydro-1,4-benzothiazepines react with dimethyl acetylenedicarboxylate in aqueous methanol to give new, unexpected condensed-skeleton heterocycles. The structures of the new compounds were determined by 1H and 13C nuclear magnetic resonance (NMR), two-dimensional (2D) heteronuclear multiple-bond correlation (HMBC), infrared (IR), and for one derivative
摘要取代的2 H -1,3-苯并噻嗪和2,3-二氢-1,4-苯并硫氮杂s与乙酰二羧酸二甲酯在甲醇水溶液中反应,生成新的,意想不到的稠骨架杂环。新化合物的结构由1 H和13 C核磁共振(NMR),二维(2D)异核多键相关(HMBC),红外(IR)以及对于一种衍生物的X射线确定分析。 图形概要
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
Fodor, Lajos; Szabo, Janos; Bernath, Gabor, Journal of Heterocyclic Chemistry, 1989, vol. 26, p. 333 - 337
作者:Fodor, Lajos、Szabo, Janos、Bernath, Gabor、Sohar, Pal、MacLean, David B.、et al.