已经制备了一系列的1-取代的2,2,3,4,4-五甲基膦酸酯,并且在用六氟丙酮处理后将其转化为相应的1,3,2-二氧杂膦酸酯。这些加合物在一定温度范围内的19 F nmr光谱给出了伪旋转过程的活化自由能值,该伪旋转过程使四元环二甲基吡咯和1位取代基位于顶峰。在与1-取代基的性质这些活化能的变化在组既是电负性和的函数的相对apicophilicity方面占p π - d π背键。探索了该假设的一些后果。描述了1,3,2-二氧杂磷杂环戊烷和相关的1,2-氧杂磷杂环戊烷的一些不寻常的反应和异构化。
P
<sup>III</sup>
/P
<sup>V</sup>
=O Catalyzed Cascade Synthesis of N‐Functionalized Azaheterocycles
作者:Trevor V. Nykaza、Gen Li、Junyu Yang、Michael R. Luzung、Alexander T. Radosevich
DOI:10.1002/anie.201914851
日期:2020.3.9
the modular synthesis of diverse N-aryl and N-alkyl azaheterocycles (indoles, oxindoles, benzimidazoles, and quinoxalinediones) is reported. The method employs a small-ring organophosphorus-based catalyst (1,2,2,3,4,4-hexamethylphosphetane P-oxide) and a hydrosilane reductant to drive the conversion of ortho-functionalized nitroarenes into azaheterocycles through sequential intermolecular reductive C-N
Organophosphorus‐Catalyzed Deoxygenation of Sulfonyl Chlorides: Electrophilic (Fluoroalkyl)sulfenylation by P
<sup>III</sup>
/P
<sup>V</sup>
=O Redox Cycling
作者:Avipsa Ghosh、Morgan Lecomte、Shin‐Ho Kim‐Lee、Alexander T. Radosevich
DOI:10.1002/anie.201813919
日期:2019.2.25
lyzed deoxygenative O‐atom transfer from sulfonyl chlorides is reported. This C−S bond‐forming reaction is catalyzed by a readily available small‐ring phosphine (phosphetane) in conjunction with a hydrosilane terminal reductant to afford a general entry to sulfenyl electrophiles, including valuable trifluoromethyl, perfluoroalkyl, and heteroaryl derivatives that are otherwise difficult to access. Mechanistic