2-Methoxy-4-nitrobenzenediazonium Salt as a Practical Diazonium-Transfer Agent for Primary Arylamines via Tautomerism of 1,3-Diaryltriazenes: Deaminative Iodination and Arylation of Arylamines without Direct Diazotization
作者:Tomoyuki Saeki、Eun-Cheol Son、Kohei Tamao
DOI:10.1246/bcsj.78.1654
日期:2005.9
1,3-Diaryltriazenes, prepared from a 2-methoxy-4-nitrobenzenediazonium salt and primary arylamines, exist as “azo-transfer” tautomers in which the 2-methoxy-4-nitrophenyl group is present on the saturated nitrogen atom and forms a hydrogen bond between the 2-methoxy group and the N–H moiety. The synthetic utility of the diazonium salt as a practical diazonium-transfer agent for primary arylamines via tautomerism of the 1,3-diaryltriazenes has been demonstrated by the deaminative iodination and arylation of the arylamines without direct diazotization. The starting 2-methoxy-4-nitrophenylamine can be easily recovered after the reactions.
1,3-二芳基三氮烯是由2-甲氧基-4-硝基苯胺盐和一元芳香胺制备的,以“偶氮转移”互变异构体的形式存在,其中2-甲氧基-4-硝基苯基基团位于饱和氮原子上,并在2-甲氧基基团和N–H部分之间形成氢键。通过1,3-二芳基三氮烯的互变异构反应,已证明该重氮盐作为一元芳香胺的实用重氮转移试剂的合成实用性,能够在不直接进行重氮化的情况下,完成一元芳香胺的去氨碘化和芳基化。反应后起始的2-甲氧基-4-硝基苯胺可以很容易地回收。