Unexpected influence and its origin in rationally tuning the electronic effect of catalysts in the asymmetric borane reduction of ketones
Unexpected influence and its origin in rationally tuning the electronic effect of catalysts in the asymmetric borane reduction of ketones
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酮不对称硼烷还原中合理调节催化剂电子效应的意外影响及其起源
DOI:
10.1016/j.molcata.2008.01.018
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发表时间:
2008-04
影响因子:
--
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中科院分区:
文献类型:
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Rationally tuning the electronic effect of catalysts is one of the most important strategies to improve stereoselectivity in asymmetric catalysis. (S)-2-aryl-3,1,2-oxazaborobicyclo[3.3.0]octanes, which can be considered as electronically tuned (S)-2-phenyl-3,1,2-oxazaborobicyclo[3.3.0]octane, were prepared and evaluated in the asymmetric borane reduction of ketones. An unexpected influence of the electronic effect of catalysts on the enantioselectivity was observed and attributed to the catalyst dimerization that was further confirmed experimentally. The unsuccessful tuning is accounted for by assuming that hydride transfer in the catalytic cycle is the rate-determining step in the reduction catalyzed by B-aryl catalysts.
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DOI:
10.1055/s-1995-3957
发表时间:
1995-05
期刊:
Synthesis
影响因子:
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作者:
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通讯作者:
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影响因子:
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作者:
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DOI:
10.1002/chin.200610040
发表时间:
2005-10
期刊:
ChemInform
影响因子:
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DOI:
10.1073/pnas.0307176101
发表时间:
2004-04
影响因子:
11.1
作者:
通讯作者:
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