Monophosphine compound, transition metal complex thereof and production method of optically active compound using the complex as asymmetric catalyst
申请人:Carreira M. Erick
公开号:US20050277772A1
公开(公告)日:2005-12-15
The present invention provides a compound represented by the formula (I):
wherein ring A is void or a benzene ring optionally having substituent(s), R
1
and R
2
are each independently a phenyl group optionally having substituent(s), a cyclohexyl group and the like, R
3
and R
4
are each independently a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group and the like, and X is a residue represented by —OR
5
or —NHR
6
wherein R
5
and R
6
are a lower alkyl group optionally having substituent(s), an aralkyl group optionally having substituent(s) and the like, a asymmetric transition metal complex containing the compound as a ligand and a production method of optically active compound using the complex as an asymmetric catalyst.
Practical Asymmetric Conjugate Alkynylation of Meldrum’s Acid-Derived Acceptors: Access to Chiral β-Alkynyl Acids
作者:Sheng Cui、Shawn D. Walker、Jacqueline C. S. Woo、Christopher J. Borths、Herschel Mukherjee、Maosheng J. Chen、Margaret M. Faul
DOI:10.1021/ja909105s
日期:2010.1.20
The enantioselective conjugate addition of alkynyl nucleophiles has been a long-standing challenge in synthetic chemistry. This paper describes a highly practical asymmetricconjugatealkynylation of Meldrum's acid-derived acceptors using cinchonidine (<$100/kg) as the chiral mediator. The process provides practical access to chiral beta-alkynyl acids. Noteworthy attributes of the method are its broad
Enantioselective Alkyne Conjugate Addition Enabled by Readily Tuned Atropisomeric <i>P</i>,<i>N</i>-Ligands
作者:Sourabh Mishra、Ji Liu、Aaron Aponick
DOI:10.1021/jacs.7b00363
日期:2017.3.8
structure, the 5-membered chiral biaryl heterocyclic scaffold represents a departure from 6-membered P,N-ligands that facilitates tuning and enables ligand evolution to address issues of selectivity and reactivity. In this vein, the Cu-catalyzedenantioselective conjugate alkynylation of Meldrum's acid acceptors is reported using Me-StackPhos. Enabled by this new ligand, the reaction tolerates a wide range
A novel Michael reaction of silyl enol ethers via hetero Diels-Alder reaction with alkylidene-Meldrum's acid
作者:Shigeo Mizukami、Nobuhiro Kihara、Takeshi Endo
DOI:10.1016/s0040-4039(00)60146-6
日期:1993.11
Alkylidene Meldrum's acid easily reacted with silylenolethers without any catalyst to afford hetero Diels-Alder adducts which could be quantitatively hydrolysed to obtain Michael adducts in good yields. The Michael adducts could be obtained diastereoselectively and could be converted to corresponding δ-ketoesters quantitatively.
Discovery and Preliminary SAR of 5-Arylidene-2,2-Dimethyl-1,3-Dioxane- 4,6-Diones as Platelet Aggregation Inhibitors
作者:Abdelaziz El Maatougui、JhonnyAzuaje、Alberto Coelho、Ernesto Cano、Matilde Yanez、Carmen Lopez、Vicente Yaziji、Carlos Carbajales、Eddy Sotelo
DOI:10.2174/138620712801619122
日期:2012.7.1
We herein document the discovery of 5-arylidene-2,2-dimethyl-1,3-dioxane-4,6-diones as a novel family of
platelet aggregation inhibitors. The preliminary optimization study enabled us to establish the most salient features of the
structure-activity relationships in this series as well as to identify novel derivatives that are upto 60 times more potent than
the hit structure 1 and slightly superior to the reference drug Milrinone.