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
Hydrolytic Kinetic Resolution of Terminal Epoxides catalyzed by Novel Bimetallic Chiral Co (Salen) Complexes
作者:Rahul B. Kawthekar、Geon‐Joong Kim
DOI:10.1080/00397910701872658
日期:2008.3.28
complexes bearing transition-metal salts have been synthesized. The easily prepared complexes exhibited very high catalytic reactivity and enantioselectivity in hydrolytic kinetic resolution (HKR) of racemicterminalepoxides and consequently provided enantiomericallyenrichedepoxides (up to 99% ee).
已经合成了带有过渡金属盐的新型双金属手性 Co (salen) 配合物。容易制备的配合物在外消旋末端环氧化物的水解动力学拆分 (HKR) 中表现出非常高的催化反应性和对映选择性,因此提供了对映异构体富集的环氧化物(高达 99% ee)。
Process for producing ß-hydroxyester
申请人:Igi Kimitaka
公开号:US20060122419A1
公开(公告)日:2006-06-08
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.