Nitrosation of 1,3-diarylureas with nitrosyl chloride, dinitrogen trioxide and dinitrogen tetroxide in dimethylformamide.
作者:MAKOTO MIYAHARA、SHOZO KAMIYA、MASAHIRO NAKADATE
DOI:10.1248/cpb.31.41
日期:——
Nitrosation of 1, 3-diarylureas (Ia-f) with nitrosyl chloride or dinitrogen trioxide in dimethylformamide gave 1, 3-diaryl-1-nitrosoureas (IIa-f) in 59-96% yields, and nitrosation of 1, 3-diarylureas (Ia, c-f) with dinitrogen tetroxide also gave 1, 3-diaryl-1-nitrosoureas (IIa, c-f) in 75-91% yields. However, nitrosation of 1, 3-bis (4-methoxyphenyl) urea (Ib) with dinitrogen tetroxide in dimethylformamide resulted in the formation of 1-(4-methoxy-2-nitrophenyl)-3-(4-methoxyphenyl) urea (III) in 60% yield, and nitrosation with a large excess of dinitrogen tetroxide gave 1, 3-bis (4-methoxy-2-nitrophenyl) urea (IV) in 42% yield.
用亚硝基氯或三氧化二氮在二甲基甲酰胺中对1,3-二芳基脲(Ia-f)进行亚硝化反应,获得了1,3-二芳基-1-亚硝脲(IIa-f),产率为59-96%;而用四氧化二氮对1,3-二芳基脲(Ia, c-f)进行亚硝化,同样获得了1,3-二芳基-1-亚硝脲(IIa, c-f),产率为75-91%。然而,使用四氧化二氮对1,3-二(4-甲氧基苯基)脲(Ib)在二甲基甲酰胺中进行亚硝化反应,形成了1-(4-甲氧基-2-硝基苯基)-3-(4-甲氧基苯基)脲(III),产率为60%;而用过量四氧化二氮进行亚硝化,则获得了1,3-二(4-甲氧基-2-硝基苯基)脲(IV),产率为42%。