The reaction of (2-chloropyridin-3-yl)(2-halophenyl)methanones, derived from 2-chloropyridine and 2-halobenzaldehydes, with two equivalents of benzenamines or arylmethanamines followed by treatment of the resulting (2-aryl(or arylmethyl)aminopyridin-2-yl)(2-halophenyl)methanones with sodium hydride in DMF at 0 degrees C to room temperature have proven to provide an efficient method for the preparation of 10-aryl(or arylmethyl)benzo[b][1,8]naphthyridin-5(10H)-ones. This methodology is shown to be applicable for the preparation benzo[b][1,7]naphthyridin-5(10H)-one derivatives by using 3-chloropyridine as a starting material in place of 2-chloropyridine.
Attempting some new approaches to 5,11-dihyro-6H-pyrido[2,3-b][1,4]benzodiazepin-6-one (6), compounds 8, 10 and 11 were prepared. Ring enlargement of 4 into 6 failed, as well as condensation of 10 and 11 into ID, which is the potential precursor of pirenzepin (11-[2′-(4″-methylpiperazin-1″-yl)]acetyl derivative of 6) via an envisaged intramolecular Diels-Alder reaction. Model compounds 5 and 13 were
尝试制备5,11-二氢-6 H-吡啶并[2,3- b ] [1,4]苯并二氮杂-6-6- one(6)的新方法,制备了化合物8、10和11。的扩环4到6不合格,以及缩合10和11到ID,其是哌仑西平和的潜在前体(11- [2' - (4“-methylpiperazin-1” -基)]乙酰基衍生物的6)通过设想的分子内Diels-Alder反应。模型化合物5和13制备和他们在类似反应中的行为解释了预期的转化4的失败,以及10和11的缩合的失败。
OKLOBDZIJA, M.;COMISSO, G.;DECORTE, E.;KOVAC, T.;ANGELI, C.;MOIMAS, F.;ZA+, J. HETEROCYCL. CHEM., 1983, 20, N 5, 1335-1338