[EN] PROCESSES FOR PRODUCING OPTICALLY PURE ß-LACTONES FROM ALDEHYDES AND COMPOSITIONS PRODUCED THEREBY [FR] PROCÉDÉS DE FABRICATION DE BÊTA-LACTONES OPTIQUEMENT PURES À PARTIR D'ALDÉHYDES ET COMPOSITIONS OBTENUES PAR CES PROCÉDÉS
乙烯酮 、 对硝基苯甲醛 在
chiral Lewis acid-Lewis base catalyst N,N-二异丙基乙胺 、 乙酰氯 作用下,
以
二氯甲烷 为溶剂,
反应 1.0h,
以87%的产率得到(4S)-4-(4-nitrophenyl)-oxetan-2-one
参考文献:
名称:
Predicting the R/S absolute configuration in asymmetric bifunctional catalysis (ABC)
摘要:
A predictive model for assigning the R/S absolute configuration in chiral Lewis base-dependent asymmetric bifunctional catalysis (ABC) has been developed. Chiral Lewis base (LB*)-dependent ABC abolishes the chiral Lewis acid (LA*) component as the stereochemical determining factor in asymmetric catalysis. By correlating the constant LB* chirality to the facial preference for the LA*-bound carbonyl group for nucleophile delivery, the R/S absolute configuration of the products can be predicted a priori. (c) 2007 Elsevier Ltd. All rights reserved.
Remote Stereoinduction in the Acylation of Fully Substituted Enolates: Tandem Reformatsky/Quaternary Claisen Condensations of Silyl Glyoxylates and β-Lactones
作者:Stephen N. Greszler、Justin T. Malinowski、Jeffrey S. Johnson
DOI:10.1021/ja108848d
日期:2010.12.15
glyoxylates and β-lactones to give highly functionalized Claisen condensation products. A heretofore undocumented instance of stereochemical 1,4-induction results in efficient transmission of β-lactonestereochemistry to the emerging fully substituted stereocenter. Second-stage transformations reveal that the five heteroatom-containing functionalities embedded within the products are entirely chemo-differentiated
Reformatsky 试剂依次与乙醛酸甲硅烷基酯和 β-内酯反应,得到高度官能化的克莱森缩合产物。迄今为止未记录的立体化学 1,4-诱导实例导致 β-内酯立体化学有效传输到新兴的完全取代的立体中心。第二阶段的转化表明,嵌入产品中的五个含杂原子的功能是完全化学分化的,这种情况允许快速组装 leustroducsin B 核心亚结构。
Predicting the R/S absolute configuration in asymmetric bifunctional catalysis (ABC)
作者:Yun-Ming Lin、Zhongtao Li、Julie Boucau
DOI:10.1016/j.tetlet.2007.05.131
日期:2007.7
A predictive model for assigning the R/S absolute configuration in chiral Lewis base-dependent asymmetric bifunctional catalysis (ABC) has been developed. Chiral Lewis base (LB*)-dependent ABC abolishes the chiral Lewis acid (LA*) component as the stereochemical determining factor in asymmetric catalysis. By correlating the constant LB* chirality to the facial preference for the LA*-bound carbonyl group for nucleophile delivery, the R/S absolute configuration of the products can be predicted a priori. (c) 2007 Elsevier Ltd. All rights reserved.
[EN] PROCESSES FOR PRODUCING OPTICALLY PURE ß-LACTONES FROM ALDEHYDES AND COMPOSITIONS PRODUCED THEREBY<br/>[FR] PROCÉDÉS DE FABRICATION DE BÊTA-LACTONES OPTIQUEMENT PURES À PARTIR D'ALDÉHYDES ET COMPOSITIONS OBTENUES PAR CES PROCÉDÉS
申请人:UNIV TOLEDO
公开号:WO2011028309A1
公开(公告)日:2011-03-10
Bi-functional cobalt-containing catalysts useful for making stereo specific compounds and compositions, along with methods of making, and uses thereof in the syntheses of optically pure β-lactones from aldehydes and ketene are described. Precursors, intermediates, compositions, and particular features of the use if the compositions, such as high enantiomeric selectivity, high yield and low mole percent of catalyst useful are provided.