Disclosed in this communication is a thorough study on the dearomative addition of organomagnesium nucleophiles to N-alkyl pyridinium electrophiles. The regiochemical outcomes have observable and predictable trends associated with the substituent patterns on the pyridinium electrophile. Often, the substituent effects can be either additive, giving high selectivities, or ablative, giving competing outcomes. Additionally, the nature of the organometallic nucleophilic component was also investigated for its role in the regioselective outcome. The effects of either reactive component are important to both the overall reactivity and site of nucleophilic addition. The utility of these observed trends is demonstrated in a concise, dearomative synthesis of a tricyclic compound shown to have insecticidal activity.

中文翻译：

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N-烷基吡啶鎓加成的预测模型

在该通信中公开了对将有机镁亲核试剂脱芳香基添加到N-烷基吡啶鎓亲电试剂中的详尽研究。区域化学结果具有与吡啶亲电体上取代基模式相关的可观察和可预测的趋势。通常，取代基效应可以是加和的，从而提供高选择性，也可以是烧蚀的，从而产生竞争结果。另外，还研究了有机金属亲核组分在区域选择性结果中的作用。任一种反应性组分的作用对于总体反应性和亲核加成位点均很重要。这些观察到的趋势的实用性通过显示具有杀虫活性的三环化合物的简洁脱芳香合成得到证明。