An Efficient Synthesis of 6-Substituted Aminohexahydro-1H-1,4-diazepines from 2-Substituted Aminopropenals.
作者:Hiroshi HARADA、Toshiya MORIE、Yoshimi HIROKAWA、Shiro KATO
DOI:10.1248/cpb.44.2205
日期:——
Swern oxidation of 2-substituted amino-1, 3-propanediols 20a-d, 38, 41, and 42 smoothly proceeded to give the oxidative dehydration products, 2-substituted aminopropenals 17a-d, 43, 45 and 46, respectively. Reaction of the intriguing 2- substituted aminopropenals 17a-d with N-benzyl-N'-methyl- or N, N'-dimethylethylenediamine(12o or 12p) followed by NaBH4 reduction of the iminium salt intermediates afforded the corresponding 6-substituted aminohexahydro-1H-1, 4-diazepines 16 and 24-28. The similar ring formation of 1H-indazole derivatives 43 and 45 employing 12o directly furnished the 1H-dindazole-3-carboxamide 4, which showed a potent serotonin-3(5-HT3) receptor antagonistic activity.
2-取代氨基-1, 3-丙二醇 20a-d、38、41 和 42 的Swern氧化平稳进行,生成了氧化脱水产物,2-取代氨基丙烯醛 17a-d、43、45 和 46。令人感兴趣的2-取代氨基丙烯醛 17a-d 与 N-苄基-N'-甲基或 N, N'-二甲基乙烯二胺(12o或12p)的反应,随后通过 NaBH4 还原亚胺盐中间体,得到了相应的6-取代氨基六氢-1H-1, 4-二氮杂烯 16 和 24-28。利用 12o 进行的1H-吲唑衍生物 43 和 45 的类似环形成直接生成了1H-双吲唑-3-羧酰胺 4,该化合物展示了强效的5-羟色胺-3(5-HT3)受体拮抗活性。