Ligand regulation for manganese-catalyzed enantioselective epoxidation of olefins without acid,Chemical Communications

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Ligand regulation for manganese-catalyzed enantioselective epoxidation of olefins without acid
Chemical Communications ( IF 4.3 ) Pub Date : 2020-09-17 , DOI: 10.1039/d0cc04440g
Daqian Xu _{1,

2,

3,

4,

5} , Qiangsheng Sun _{1,

2,

3,

4,

5} , Jin Lin _{1,

2,

3,

4,

5} , Wei Sun _{1,

2,

3,

4,

5}

Affiliation

A novel manganese catalyst bearing an L-proline-derived N4 ligand has been developed for enabling acid-free asymmetric epoxidation of olefins with tert-butyl hydroperoxide as the oxidant. A variety of olefins that are well-matched in size with the ligand pocket can be transformed to epoxides with excellent enantioselectivities. The smaller ligand pocket is also beneficial to the enantioselective epoxidation of simple olefins. Cryospray ionization mass spectrometry experiments reveal that a Mn^IV [double bond, length as m-dash]

O species serves as an active epoxidizing species.

中文翻译：

不含酸的烯烃对锰催化的对映选择性环氧化的配体调节

已经开发了带有L-脯氨酸衍生的N 4配体的新型锰催化剂，其能够使用叔丁基氢过氧化物作为氧化剂实现烯烃的无酸不对称环氧化。大小与配位体袋完全匹配的各种烯烃可以转化为具有出色对映选择性的环氧化物。较小的配体口袋也有利于简单烯烃的对映选择性环氧化。低温喷雾电离质谱实验表明，Mn ^IV [双键，长度为m-破折号]

O物种可作为活性环氧化物种。

更新日期：2020-09-25

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