Structures of Saturated 5H-Pyrrolo[1,2-a][3,1]benzoxazin-1(2H)-ones Prepared from 4-Oxopentanoic Acid and Cyclic Amino Alcohols
作者:Henri Kivelä、Karel D. Klika、Angela Szabó、Géza Stájer、Kalevi Pihlaja
DOI:10.1002/ejoc.200200662
日期:2003.5
Saturated heterocycles containing two condensed heterocyclic rings and a carbo(bi)cyclic ring have been prepared by the reaction of 4-oxopentanoic acid (1) with (bi)cyclic amino alcohols. 5H-Pyrrolo[1,2-a][3,1]benzoxazin-1(2H)-ones 2−5 were formed in the reaction of 1 with trans- or cis-2-(hydroxymethyl)cyclohexylamines or -cyclohexenylamines. With di-endo- or di-exo-3-aminobicyclo[2.2.1]hept-2-yl-
含有两个稠合杂环和一个碳(双)环的饱和杂环已通过 4-氧代戊酸(1)与(双)环氨基醇的反应制备。5H-Pyrrolo[1,2-a][3,1]benzoxazin-1(2H)-ones 2-5 是在 1 与反式或顺式-2-(羟甲基)环己胺或-环己烯胺的反应中形成的。使用 di-endo- 或 di-exo-3-aminobicyclo[2.2.1]hept-2-yl- 或 -hept-5-en-2-ylmethanols,1 产生了相应的衍生物 6-9,它们在环己烷或环己烯环。合成的立体选择性高;只有 5、7 和 9 两种 C-3a 差向异构体均以可观察的量产生。通过应用标准脉冲技术通过NMR光谱方法建立结构。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)