Mechanistic study of gold(I)-catalyzed intermolecular hydroamination of allenes.
Mechanistic study of gold(I)-catalyzed intermolecular hydroamination of allenes.
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DOI:
10.1021/ja105530q
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发表时间:
2010-09-22
影响因子:
15
通讯作者:
Toste, F. Dean
中科院分区:
文献类型:
--
作者:
Wang, Z. Jane;Benitez, Diego;Tkatchouk, Ekaterina;Goddard, William A., III;Toste, F. Dean
The intermolecular hydroamination of allenes occurs readily with hydrazide nucleophiles, in the presence of 3–12% Ph3PAuNTf2. Mechanistic studies have been conducted to establish the resting state of the gold catalyst, the kinetic order of the reaction, the effect of ligand electronics on the overall rate, and the reversibility of the last steps in the catalytic cycle. We have found the overall reaction to be first order in gold and allene and zero order in nucleophile. Our studies suggest that the rate-limiting transition state for the reaction does not involve the nucleophile and that the active catalyst is monomeric in gold(I). Computational studies support an “outersphere” mechanism and predicts that a two-step, no intermediate mechanism may be operative. In accord with this mechanistic proposal, the reaction can be accelerated with the use of more electron deficient phosphine ligands on the gold(I) catalyst.
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通讯作者:
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