Studies on diazepines. XXII. Synthesis of monocyclic 1,4-dihetero seven-membered ring compounds using thermal valence bond isomerization of tricyclo(4.1.0.02.5)heptane systems.
作者:JYOJI KURITA、KUNIYOSHI IWATA、HIROICHI SAKAI、TAKASHI TSUCHIYA
DOI:10.1248/cpb.33.4572
日期:——
The 3-azatricyclo [4.1.0.02.5] heptanes (11-14) prepared readily from pyridines via 2-azabicyclo [2.2.0] hexa-5-enes (10) were found to be useful synthons for seven-membered heterocycles. The thermolysis of the compounds (11-13) having an oxygen, a nitrogen, or a sulfur atom in the 7-position resulted in valence bond isomerization with ring opening, giving rise to the corresponding 1, 4-dihetero seven-membered ring compounds, 1, 4-oxazepine (15), 1, 4-diazepine (16), and 1, 4-thiazepine (17) derivatives. The 3-azatricycloheptane (14) having no hetero atom in the 7-position also afforded the azepine derivative (18).
从吡啶通过 2-氮杂双环 [2.2.0] 六烯(10)易于制备的 3-氮杂三环 [4.1.0.02.5] 七烷(11-14)被发现是七元杂环的有用合成子。化合物(11-13)在 7 位置具有氧、氮或硫原子的热分解反应导致价键异构化和环的开裂,生成相应的 1,4-二杂七元环化合物:1,4-氧杂庚烯(15)、1,4-氮杂庚烯(16)和 1,4-硫杂庚烯(17)衍生物。而 7 位置没有杂原子的 3-氮杂三环七烷(14)也产生了氮杂庚烯衍生物(18)。