Isotope effects and mechanism of the asymmetric BOROX Brønsted acid catalyzed aziridination reaction.

Isotope effects and mechanism of the asymmetric BOROX Brønsted acid catalyzed aziridination reaction.
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DOI:
10.1021/jo302783d
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发表时间:
2013-06-07
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Wulff WD
Wulff WD
中科院分区:
其他
文献类型:
--
作者:
Vetticatt MJ;Desai AA;Wulff WD

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采用实验动力学同位素效应和理论计算相结合的方法,研究了手性VANOL-BOROX-Brønsted酸催化亚胺和重氮乙酸乙酯的氮杂环丙烷化反应的机理.一个逐步的机制,其中可逆形成的重氮离子中间体之前限速闭环形成顺式氮丙啶牵连。提出了一个修正模型的基础上的闭环过渡结构的相对能量的对映体和非对映体选择性的起源。
The mechanism of the chiral VANOL-BOROX Brønsted acid catalyzed aziridination reaction of imines and ethyldiazoacetate has been studied using a combination of experimental kinetic isotope effects and theoretical calculations. A stepwise mechanism where reversible formation of a diazonium ion intermediate precedes rate-limiting ring-closure to form the cis-aziridine is implicated. A revised model for the origin of enantio- and diastereoselectivity is proposed based on relative energies of the ring closing transition structures.
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