Enzymes in organic chemistry — 5: First and chemo-enzymatic synthesis of α-aminooxyphosphonic acids of high enantiomeric excess
摘要:
alpha-Acyloxyphosphonates (+/-)-5a and (+/-)-5b, derived from 3-phenylpropionaldehyde and acetaldehyde. were involved by lipase-catalyzed enantioselective hydrolysis. Three of the four chiral, non-racemic alpha-hydroxyphosphonates obtained had 99% ee. the fourth 91%. They were transformed chemically into alpha-aminooxyphosphonic acids. (C) 1997 Elsevier Science Ltd.
Enzymes in Organic Chemistry, 11:[1] Hydrolase-Catalyzed Resolution ofα- andβ-Hydroxyphosphonates and Synthesis of Chiral, Non-Racemicβ-Aminophosphonic Acids
作者:A. Woschek、Wolfgang Lindner、F. Hammerschmidt
DOI:10.1002/adsc.200303135
日期:2003.12
enantioselective acylation of racemic diisopropyl α- and β-hydroxyphosphonates by hydrolases in t-butyl methyl ether with isopropenyl acetate as acyl donor is limited by the narrow substrate specificity of the enzymes. High enantiomeric excesses (up to 99%) were obtained for the acetates of (S)-diisopropyl 1-hydroxy-(2-thienyl)methyl-, 1-hydroxyethyl- and 1-hydroxyhexylphosphonate and (R)-diisopropyl 2-hydroxypropylphosphonate
Asymmetric Hydrogenation of α-Keto Phosphonates with Chiral Palladium Catalysts
作者:Nataliya S. Goulioukina、Grigorii N. Bondarenko、Alexei V. Bogdanov、Konstantin N. Gavrilov、Irina P. Beletskaya
DOI:10.1002/ejoc.200800943
日期:2009.2
Under atmospheric hydrogen pressure, a catalytic amount of palladium(II) trifluoroacetate and (R)-MeO-BIPHEP in 2,2,2-trifluoroethanol promoted the asymmetrichydrogenation of diisopropyl α-ketophosphonates 1 to afford the corresponding α-hydroxy phosphonates 2 in excellent yields and with a moderate enantioselectivities of up to 55 % ee. Racemic α-aryl-α-hydroxy phosphonates can be prepared by using
was accomplished by using a commercially available Noyori-type catalyst. The highly enantioenriched products (ee >98 % in all cases but one) were further converted to the phosphonic acidanalogs of 15 aminocarboxylic acids. The established method can also be used for the asymmetric transfer deuteration (ATD) of the starting α-oxo-phosphonates.