The first cobalt-catalyzed asymmetric Kumada cross-coupling with high enantioselectivity has been developed. The reaction affords a unique strategy for the enantioselective arylation of α-bromo esters catalyzed by a cobalt-bisoxazoline complex. A variety of chiral α-arylalkanoic esters were prepared in excellent enantioselectivity and yield (up to 97% ee and 96% yield). The arylated products were transformed
enantioselective Negishi cross‐coupling reaction, and the first arylation of α‐halo esters with arylzinc halides, are disclosed. Employing a cobalt‐bisoxazoline catalyst, various α‐arylalkanoic esters were synthesized in excellent enantioselectivities and yields (up to 97 % ee and 98 % yield). A diverse range of functional groups, including ether, halide, thioether, silyl, amine, ester, acetal, amide, olefin
NEW PHENYLAZETIDINECARBOXYLATE OR -CARBOXAMIDE COMPOUNDS
申请人:INVENTIVA
公开号:US20170066717A1
公开(公告)日:2017-03-09
The invention relates to compounds of formula (I).
where R, R
1
, R
2
, n, A and Cy have the meanings indicated in the description.
The compounds of formula (I) are Nurr-1 modulators.
A robust method for preparing (3S)-3-alkyl-3-phenyl-1,4-dioxane-2,5-diones was developed using an improved cyclocondensation reaction between (S)-α-alkylmandelic acids and 2-bromocarbonyl halides. Subtle differences in the reaction conditions, including separate additions of triethylamine, significantly increased the yield compared with Schollkopf's original method.
Catalytic Asymmetric Hiyama Cross-Couplings of Racemic α-Bromo Esters
作者:Xing Dai、Neil A. Strotman、Gregory C. Fu
DOI:10.1021/ja8009428
日期:2008.3.1
The first catalyticasymmetriccross-coupling of α-halo carbonyl compounds with aryl metal reagents has been developed, thereby generating synthetically useful α-aryl carboxylic acid derivatives in good enantiomeric excess. The method can also be applied to enantioselective alkenylation reactions.