of hybrid catalysts incorporating chloramphenicol base with another chiral scaffold using a squaramide linker have been developed and successfully applied in Michael addition of 2,3-dihydrobenzofuran-2-carboxylates to nitroolefins. The controlling experiments suggested that the hybrid catalysts were more reactive than non-hybridized bifunctional catalysts and the matching of chiralities between two
The invention provides a compound of formula I:
or a pharmaceutically acceptable salt thereof, wherein the variables X, Y
1
-Y
5
, R
1
, R
2
, R
3
, R
4
, and Het have the meaning as described herein, and compositions containing such compounds and methods for using such compounds and compositions.
Highly Enantioselective Michael Addition of 2-Oxindole- 3-carboxylate Esters to Nitroolefins Promoted by Cinchona Alkaloid-Thiourea-Brønsted Acid Cocatalysts
作者:Xianjie Chen、Wei Zhu、Wangke Qian、Enguang Feng、Yu Zhou、Jinfang Wang、Hualiang Jiang、Zhu-Jun Yao、Hong Liu
DOI:10.1002/adsc.201200206
日期:2012.8.13
A highly efficient organocatalyzed Michael addition of 2-oxindole-3-carboxylate esters to nitroolefins using a Cinchona alkaloid-thiourea and an achiral Brønsted acid as cooperative organocatalysts is reproted that affords significantly improved enantioselectivity and diastereoselectivity. It also provides an efficient approach to the synthesis of spirooxindole derivatives with high enantioselectivity
Catalytic Enantioselective Ring-Opening and Ring-Closing Reactions of 3-Isothiocyanato Oxindoles and <i>N</i>-(2-Picolinoyl)aziridines
作者:Linqing Wang、Dongxu Yang、Dan Li、Rui Wang
DOI:10.1021/acs.orglett.5b01291
日期:2015.6.19
applied to an asymmetric formal [3 + 3] cycloaddition reaction with aziridines for the first time. The reaction was efficiently mediated by an in situ generated magnesium catalyst employing (R)-3,3′-fluorous-BINOL as a simple chiral ligand. Serials of polycyclic frameworks could be obtained after a ring-closing step. The enantioenriched ring-opening product was also utilized to modified amino acids, peptides
Hydrogen-Bond-Directed Enantioselective Decarboxylative Mannich Reaction of β-Ketoacids with Ketimines: Application to the Synthesis of Anti-HIV Drug DPC 083
作者:Hai-Na Yuan、Shuai Wang、Jing Nie、Wei Meng、Qingwei Yao、Jun-An Ma
DOI:10.1002/anie.201210361
日期:2013.4.2
Key to success: The title reaction provides facile access to enantioenriched 3,4‐dihydroquinazolin‐2(1H)‐ones containing a quaternary stereogenic center in high yields with excellent enantioselectivities. Subsequent transformations lead to the convenient preparation of the anti‐HIV drug DPC 083 and N‐fused polycyclic compounds without loss of enantiomeric excess.