An improved chemical and enzymatic synthesis of new fructose derivatives for import studies by the glucose transporter in parasites
This paper presents the chemoenzymatic synthesis of D-fructose analogues substituted at position C6. These compounds are the unique products of rabbit muscle aldolase catalyzed aldolisation of D-glyceraldehyde analogues (obtained by stereospecific chemical synthesis) with DHAP, followed by a dephosphorylation step with acid phosphatase.
The first total synthesis of tetrahydrobenzo[a]anthraquinone natural product (±)-zenkequinone B (1) is reported. The key step involves the TiCl4-promoted intramolecular cyclization of 4-aryl-2-hydroxybutanal diethyl acetal 4 to give compound 3.
Devulapally, Rammohan,Hon, Yung-Son
scheme or table
p. 3183 - 3185
(2011/06/28)
Enzymes in Organic Synthesis: Synthesis of Highly Enantiomerically Pure 1,2-Epoxy Aldehydes, Epoxy Alcohols, Thiirane, Aziridine, and Glyceraldehyde 3-Phosphate
This paper describes a chemoenzymatic procedure for the synthesis of (R)- and (S)-glycidaldehyde diethyl acetal (4 and 5). 2-Acetoxy-3-chloropropanal diethyl acetal (1c) was enantioselectively hydrolyzed by LP-80 lipase to give (S)-3-chloro-2-hydroxypropanal diethyl acetal (2c) and the unreacted acetate (3c), both in >95percent calculated yield and >98percent ee.Both products were subsequently converted to epoxides 4 and 5, respectively.Resolutions of 2-acetoxy-1-(benzyloxy)-3-chloropropane (11a) and 3-(allyloxy)-2-acetoxypropyl p-toluenesulfonate (14b) were similarly carried out to give the corresponding optically active 2-hydroxy and 2-acetoxy derivatives in 90percent and >95percent ee.These products were subsequently converted to the corresponding 1,2-epoxides.Nucleophilic opening of epoxide 4 was exemplified by the syntheses of (R)-3-azido-2-hydroxypropanal and D-glyceraldehyde 3-phosphate.Conversion of the chiral epoxides to thiirane and aziridine was also described.
Pederson, Richard L.,Liu, Kevin K.-C.,Rutan, James F.,Chen, Lihren,Wong, Chi-Huey
p. 4897 - 4901
(2007/10/02)
Deoxyribose-5-phosphate aldolase as a synthetic catalyst
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Barbas III, Carlos F.,Wang, Yi-Fong,Wong, Chi-Huey
p. 2013 - 2014
(2007/10/02)
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