Lithium Enolates in the Enantioselective Construction of Tetrasubstituted Carbon Centers with Chiral Lithium Amides as Noncovalent Stereodirecting Auxiliaries
作者:Kai Yu、Ping Lu、Jeffrey J. Jackson、Thuy-Ai D. Nguyen、Joseph Alvarado、Craig E. Stivala、Yun Ma、Kyle A. Mack、Trevor W. Hayton、David B. Collum、Armen Zakarian
DOI:10.1021/jacs.6b11673
日期:2017.1.11
Lithium enolates derivedfrom carboxylic acids are ubiquitous intermediates in organic synthesis. Asymmetric transformations with these intermediates, a central goal of organic synthesis, are typically carried out with covalently attached chiral auxiliaries. An alternative approach is to utilize chiral reagents that form discrete, well-defined aggregates with lithium enolates, providing a chiral environment
The invention is concerned with novel mandelic acid derivatives of formula (I)
1
wherein R
1
to R
10
, X and Y are as defined in the description and in the claims, as well as pharmaceutically acceptable salts thereof.
These compounds inhibit the formation of coagulation factors Xa, IXa and thrombin induced by factor VIIa and tissue factor.
Convenient Synthesis of 3-Alkoxy-3-aryloxindoles by Intramolecular Arylation of Mandelic Amides
作者:J. Mikael Hillgren、Stephen P. Marsden
DOI:10.1021/jo8010842
日期:2008.8.1
Medicinally important 3-alkoxy-3-aryloxindoles are conveniently prepared by the rapid microwave-promoted palladium-catalyzed intramolecular enolate arylation of mandelate-derived anilides.