Cu(I)-Catalyzed, α-Selective, Allylic Alkylation Reactions between Phosphorothioate Esters and Organomagnesium Reagents
作者:Andrew M. Lauer、Farzeen Mahmud、Jimmy Wu
DOI:10.1021/ja202954b
日期:2011.6.15
of allylic alkylation reactions involving hard nucleophiles remains a significant challenge and continues to be an active area of research. The lack of general methods in which α-alkylation is favored underscores the need for the development of new processes for achieving this type of selectivity. We report that Cu(I) catalyzes the allylic substitution of phosphorothioate esters with excellent α-regioselectivity
Spirobenzylamine-Phosphine, Preparation Method Therefor And Use Thereof
申请人:Zhou Qilin
公开号:US20140194638A1
公开(公告)日:2014-07-10
The present invention relates to a spirobenzylamine-phosphine, preparation method therefor and use thereof. The compound has a structure represented by formula (I), wherein n=0 to 3; R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
and R
9
having a value as defined in claim
1
. Starting from the substituted 7-trifluoromesyloxy-7′-diarylphosphino-1,1′-spiro-dihydroindene, the compound is synthesized in a two-step or three-step reactions. The new spirobenzylamine-phosphine is complexed with an iridium precursor and is subjected to ion exchange, to give an Iridium/spirobenzylamine-phosphine complex comprising various anions. The spiro benzyl amine-phosphine/Iridium complex according to the present invention may be used for catalyzing asymmetry hydrogenation of a variety of alpha-substituted acrylic acids, has high activity and enantio-selectivity, and has a good prospect of industrialization.
Highly Diastereoselective Preparation of (<i>E</i>)-Alkenylsilanes Bearing an α-Chiral Center
作者:Sylvie Perrone、Paul Knochel
DOI:10.1021/ol063097o
日期:2007.3.1
The copper(I)-mediated anti-S(N)2' allylic substitution allows a highly stereoselective preparation of alkenylsilanes bearing a chiral center in the alpha-position with high transfer of chirality. These alkenylsilanes were converted into alpha,beta-unsaturated ketones or into the corresponding boronic esters without loss of the chiral information. [reaction: see text]
Conformational Preference in Bis(porphyrin) Tweezer Complexes: A Versatile Chirality Sensor for α-Chiral Carboxylic Acids
作者:Marina Tanasova、Babak Borhan
DOI:10.1002/ejoc.201200147
日期:2012.6
determinant of binding conformation. Experimental results indicate that a balance between linker flexibility and rigidity could yield an optimum porphyrintweezer that stabilizes a common conformation for all bound chiral guests. This leads to a more simplified approach to absolute stereochemical determination of asymmetry for small organic molecules. This was demonstrated by the use of a C3-linked zincated
The present invention provides a compound of formula I;
a method for manufacturing the compounds of the invention, and its therapeutic uses. The present invention further provides a combination of pharmacologically active agents and a pharmaceutical composition.