Enantioselective extraction of d,l-tryptophan by a new chiral selector: Complex formation with di(2-ethylhexyl)phosphoric acid and O,O′-dibenzoyl-(2R,3R)-tartaric acid

2006 ◽  
Vol 49 (2) ◽  
pp. 186-191 ◽  
Author(s):  
Bin Tan ◽  
GuangSheng Luo ◽  
Xuan Qi ◽  
JiaDing Wang
Keyword(s):  
Complex Formation ◽  
Phosphoric Acid ◽  
Tartaric Acid ◽  
Chiral Selector ◽  
Enantioselective Extraction

scholarly journals Stereoselective Biginelli-like reaction catalyzed by a chiral phosphoric acid bearing two hydroxy groups

2020 ◽  
Vol 16 ◽  
pp. 1875-1880 ◽  
Author(s):  
Xiaoyun Hu ◽  
Jianxin Guo ◽  
Cui Wang ◽  
Rui Zhang ◽  
Victor Borovkov
Keyword(s):  
Phosphoric Acid ◽  
Tartaric Acid ◽  
Chiral Phosphoric Acid ◽  
Hydroxy Groups

To develop new efficient stereoselective catalysts for Biginelli-like reactions, a chiral phosphoric acid bearing two hydroxy groups derived from ʟ-tartaric acid was successfully synthesized via highly regioselective transformations of enantiopure 1,1,4,4-tetraphenylbutanetetraol. The obtained catalyst effectively catalyzed Biginelli-like reactions with moderate to good enantioselectivities. Control experiments indicated that the presence of the two hydroxy groups were indispensable for achieving a high enantioselectivity.

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