Thermolysis of various 4- and/or 6-methyl-1, 2-diazepines (12a, b and 18a-e), prepared from pyridine and lutidine N-imides (11 and 17a-d) having a methyl group in the 3-position, gave the corresponding 1, 3-diazepines (13 and 19) and the 2-aminopyridine derivatives (14 and 20), whereas 1, 2-diazepines (9a-d) having no methyl group in the 4- or 6-position gave only the parent N-imides (8) and no 1, 3-diazepines. Heating of the 2, 3-diazabicyclo [3. 2. 0] hepta-3, 6-dienes (21a, b) formed from the corresponding 1, 2-diazepines by irradiation also gave the 1, 3-diazepines (13a and 19b).
各种4-和/或6-
甲基-1,2-二
氮杂
环庚烷(12a, b 和 18a-e)的热解反应,这些化合物由
吡啶和3-
甲基氮杂
环庚烷N-内
酰胺(11 和 17a-d)制备而得,生成了相应的1,3-二
氮杂
环庚烷(13 和 19)和2-
氨基
吡啶衍生物(14 和 20)。然而,不含4-或6-
甲基的1,2-二
氮杂
环庚烷(9a-d)仅生成母体N-内
酰胺(8),而没有生成1,3-二
氮杂
环庚烷。将由相应1,2-二
氮杂
环庚烷通过辐射形成的2,3-二
氮杂
双环[3.2.0]庚-3,6-二烯(21a, b)加热,也得到了1,3-二
氮杂
环庚烷(13a 和 19b)。