Enantioselective Resolution Copolymerization of <i>Racemic</i> Epoxides and Anhydrides: Efficient Approach for Stereoregular Polyesters and Chiral Epoxides
作者:Jie Li、Bai-Hao Ren、Zhao-Qian Wan、Shi-Yu Chen、Ye Liu、Wei-Min Ren、Xiao-Bing Lu
DOI:10.1021/jacs.9b02722
日期:2019.6.5
strategy for preparing isotactic polyesters and chiral epoxides via enantioselective resolution copolymerization of racemic terminal epoxides with anhydrides, mediated by enantiopure bimetallic complexes in conjunction with a nucleophilic cocatalyst. The chirality of both the axial linker and the diamine backbones of the ligand are responsible for the chiral induction of this kinetic resolution copolymerization
A new dinuclear chiral salen complexes for asymmetric ring opening and closing reactions: Synthesis of valuable chiral intermediates
作者:Santosh Singh Thakur、Shu-Wei Chen、Wenji Li、Chang-Kyo Shin、Seong-Jin Kim、Yoon-Mo Koo、Geon-Joong Kim
DOI:10.1016/j.jorganchem.2005.12.044
日期:2006.4
A new dinuclear chiral Co(salen) complexes bearing group 13 metals have been synthesized and characterized. The easily prepared complexes exhibited very high catalytic reactivity and enantioselectivity for the asymmetric ring opening of epoxides with H2O, chloride ions and carboxylic acids and consequently provide enantiomerically enriched terminalepoxides (>99% ee). It also catalyzes the asymmetric
A process for producing a β-hydroxyester by reacting an epoxide, an alcohol and carbon monoxide in the presence of a cobalt carbonyl compound as catalyst,
which is characterized in using as co-catalyst, a pyridine derivative having an amino substituent of formula (1),
wherein R
1
and R
2
are independently hydrogen, formyl, acyl, alkoxycarbonyl, substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, substituted or unsubstituted aryl, or R
1
and R
2
may be taken together with the adjacent nitrogen atom to form a ring, and n is an integer of 1 or 2.
A process for producing a β-hydroxyester by reacting an epoxide, an alcohol and carbon monoxide in the presence of a cobalt carbonyl compound as catalyst,
which is characterized in using as co-catalyst, a pyridine derivative having an amino substituent of formula (1),
wherein R1 and R2 are independently hydrogen, formyl, acyl, alkoxycarbonyl, substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, substituted or unsubstituted aryl, or R1 and R2 may be taken together with the adjacent nitrogen atom to form a ring, and n is an integer of 1 or 2.