作者:S. Shashidhar Reddy、B. George Vineel、S. Venkataiah、A. Naidu、P.K. Dubey
DOI:10.14233/ajchem.2015.18894
日期:——
4-Chlorobenzaldehyde (1) was reacted with crotononitrile (2) in the presence of sodium cyanide yielding 4-(4-chlorophenyl)-3-methyl-4-oxobutyronitrile (3) which on refluxing with concentrated HCl gave 4-(4-chlorophenyl)-3-methyl-4-oxobutyric acid (4). The latter, on treatment with fuming nitric acid, yielded 4-(4-chloro-3-nitrophenyl)-3-methyl-4-oxobutyric acid (5), which on treatment with hydrazine hydrate gave 6-(4-chloro-3-nitrophenyl)-5-methyl-4,5-dihydro-2H-pyridazine-3-one (6). Azidation and reduction of 6 with sodium azide gave the amino derivative 7 which on reductive alkylation gave 10(a-i) followed by reduction with commercially available sodium hydrogen sulphide solution gave the substituted diamine derivative 11(a-i). The compound 7 directly undergoes reduction with sodium hydrogen sulphide yielding (8). Finally, 8 and 11(a-i) was converted into the target compounds by diazotized-cyclization with sodium nitrite giving pyridazinonylbenzotriazoles 9 and 12( a-i).
在氰化钠存在下,4-氯苯甲醛(1)与巴豆腈(2)反应,生成 4-(4-氯苯基)-3-甲基-4-氧代丁腈(3),用浓盐酸回流,生成 4-(4-氯苯基)-3-甲基-4-氧代丁酸(4)。后者经发烟硝酸处理后得到 4-(4-氯-3-硝基苯基)-3-甲基-4-氧代丁酸(5),经肼水合物处理后得到 6-(4-氯-3-硝基苯基)-5-甲基-4,5-二氢-2H-哒嗪-3-酮(6)。用叠氮化钠对 6 进行叠氮和还原反应,得到氨基衍生物 7,再进行还原烷基化反应,得到 10(a-i),然后用市售的硫化氢钠溶液进行还原反应,得到取代二胺衍生物 11(a-i)。化合物 7 直接与硫化氢钠发生还原反应,生成 (8)。最后,8 和 11(a-i)通过亚硝酸钠重氮化-环化反应转化为目标化合物,得到哒嗪酮基苯并三唑 9 和 12(a-i)。