Alkylation of 2-bromoaniline with benzyl bromide under ostensibly basic N-alkylation conditions resulted in migration of bromine from the 2- to the 4-aryl position. Herein we report our studies to elucidate the mechanism of this rearrangement with the objective of suppressing this unexpected outcome. We find that careful choice of reagents is critical, and that this behavior may be extrapolated to alkylation reactions of electron-rich bromo- and iodoanilines in general.

中文翻译：

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双相烷基化条件下 2-溴苯胺的意外重排

在表面上呈碱性的 N-烷基化条件下，2-溴苯胺与苄基溴的烷基化导致溴从 2- 到 4-芳基位置的迁移。在此，我们报告了我们的研究，以阐明这种重排的机制，目的是抑制这种意想不到的结果。我们发现谨慎选择试剂是至关重要的，并且这种行为通常可以外推到富含电子的溴苯胺和碘苯胺的烷基化反应。