Condensation of dihaloalkanes to 1,2,4-triazepine 1a in the Phase Transfer Catalysis (P.T.C.) conditions provides efficient and facile access to biheterocyclic triazepines with high regioselectivity. In the same conditions, the triazepinone 1b has been found to degradate after alkylation to give pyrazoles.
在相转移催化(
PTC)条件下将二卤代
烷烃缩合为1,2,4-三氮杂ze 1a提供了高效且容易地获得具有高区域选择性的双杂环三氮杂s的方法。在相同条件下,发现三氮杂
庚酮1b在烷基化后降解,得到
吡唑。