CAMPHOR-DERIVED COMPOUNDS, METHOD FOR MANUFACTURING THE SAME, AND APPLICATION THEREOF
申请人:UANG Biing-Jiun
公开号:US20120077976A1
公开(公告)日:2012-03-29
Camphor-derived compounds are disclosed, which are represented as the following formula (I):
wherein R
1
, R
2
, R
3
, and R
4
each are defined as described in the specification. In addition, a method for manufacturing the camphor-derived compounds and application thereof are disclosed.
Predicted outcomes: The additionreaction of organoboronicacids with aldehydes in the presence of K2CO3 catalyzed by CoI2/(R,R)‐BDPP gives chiral secondary alcohols in excellent yields with 90–99 % enantiomeric excess (see scheme; (R,R)‐BDPP=(2R,4R)‐(+)‐2,4‐bis(diphenylphosphino)pentane). This method provides an alternative to prepare an R and S enantiomeric pair by using the same chiral ligand and
预期的结果:在CoI 2 /(R,R)-BDPP催化下,在存在K 2 CO 3的情况下,有机硼酸与醛的加成反应可得到出色的手性仲醇,对映体过量90-99%(参见方案;(R,R)-BDPP =(2 R,4 R)-(+)-2,4-双(二苯基膦基)戊烷)。该方法提供了另一种通过使用相同的手性配体制备R和S对映体对的方法,并且可以预测反应的立体化学结果。
Synthesis of novel planar chiral Ag and Rh N-heterocyclic carbene complexes derived from [2.2]paracyclophane and their application in ultrasound assisted asymmetric addition reactions of organoboronic acids to aldehydes
作者:Wenzeng Duan、Yudao Ma、Fuyan He、Lei Zhao、Jianqiang Chen、Chun Song
DOI:10.1016/j.tetasy.2013.01.017
日期:2013.3
planar chiral N-heterocyclic carbene silver and rhodium complexes based on [2.2]paracyclophane have been prepared. These could be used as catalysts/precatalysts for the asymmetric 1,2-addition of organoboronic acids to aldehydes. We optimized the reaction conditions and have applied ultrasonic irradiation in the asymmetric arylation for the first time. Under ultrasound irradiation, the combination
A method for synthesis of secondary alcohols is provided for pharmaceutical secondary alcohol by addition of organoboronic acids with aldehydes in presence of the cobalt ion and bidentate ligands as the catalyst. In addition, an enantioselective synthesis method for secondary alcohols is also herein provided in the present invention. The present invention has advantages in using less expensive cobalt ion and commercially available chiral ligands as the catalyst, wide scope of organoboronic acids and aldehydes compatible with this catalytic reaction and achieving excellent yields and/or enantiomeric excess.
Chiral Lithium Amido Aryl Zincates: Simple and Efficient Chemo‐ and Enantio‐Selective Aryl Transfer Reagents
作者:Pauline Chaumont‐Olive、Mathieu Rouen、Gabriella Barozzino‐Consiglio、Amel Ben Abdeladhim、Jacques Maddaluno、Anne Harrison‐Marchand
DOI:10.1002/anie.201813510
日期:2019.3.4
An enantioselective aryl transfer is promoted using chiral tricoordinated lithium amido aryl zincates that are easily accessible reagents and whose chiral appendage is simply recovered for reuse. The arylation reaction is run in good yields (60 % average on twenty substrates) and high enantiomericexcesses (95 % ee average). This occurs whatever the ortho, meta, or para substituent borne by the substrate