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
复制标题

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
复制
发表时间:
2008-04
影响因子:
--
通讯作者:
--
中科院分区:
化学2区
文献类型:
--
作者:

文献摘要

参考文献

相似文献

合理调控催化剂的电子效应是提高不对称催化立体选择性的重要策略之一。合成了(S)-2-芳基-3,1,2-氧氮硼双环[3.3.0]辛烷(可视为电子调谐的(S)-2-苯基-3,1,2-氧氮硼双环[3.3.0]辛烷),并评价了其在酮的不对称硼烷还原反应中的应用。催化剂的电子效应对对映体选择性的一个意想不到的影响被观察到,并归因于催化剂的二聚反应,这是进一步实验证实。不成功的调谐是占通过假设在催化循环中的氢化物转移是B-芳基催化剂催化的还原中的速率决定步骤。
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.
DOI: 10.1055/s-1995-3957
发表时间: 1995-05
期刊: Synthesis
影响因子: --
作者:
Graham B Jones;Brant J. Chapman
通讯作者: Graham B Jones;Brant J. Chapman
DOI: 10.1016/j.tetasy.2004.10.029
发表时间: 2004-12
影响因子: --
作者:
H. Nakagawa;Y. Sei;K. Yamaguchi;T. Nagano;T. Higuchi
通讯作者: H. Nakagawa;Y. Sei;K. Yamaguchi;T. Nagano;T. Higuchi
DOI: 10.1016/j.tetasy.2007.03.032
发表时间: 2007-04
影响因子: --
作者:
Linge Ma;P. Jiao;Qihan Zhang;D. Du;Jiaxi Xu
通讯作者: Linge Ma;P. Jiao;Qihan Zhang;D. Du;Jiaxi Xu
DOI: 10.1002/chin.200610040
发表时间: 2005-10
期刊: ChemInform
影响因子: --
作者:
Jiaxi Xu;Y. Lan;Tiezheng Wei;Qihan Zhang
通讯作者: Jiaxi Xu;Y. Lan;Tiezheng Wei;Qihan Zhang
DOI: 10.1073/pnas.0307176101
发表时间: 2004-04
影响因子: 11.1
作者:
通讯作者: --