Racemic α-acyloxyalkylphosphonates (±)-4 are prepared and tested for kinetic resolution by lipases AP 6 and to a minor extent by F-AP 15. The former proves to be a useful enzyme in terms of broadness of application, reaction rate and enantiomeric excess. Lipase F-AP 15 transformed neither of the two substrates checked for hydrolysis. Enzymatic hydrolysis of α-acyloxyphosphonates containing straight chain alkyl groups with lipase AP 6 yields (S)-α-hydroxyalkylphosphonates 3 preferentially. Substrates with branched chain alkyl groups are hydrolysed with lower enantioselectivity, the (R)-ester being saponified more easily than the (S)-ester.
制备了外消旋δ-±-乙酰氧基烷基膦酸盐 (±)-4,并通过脂肪酶 AP 6 和少量 F-AP 15 进行了动力学解析测试。前者在应用广泛性、反应速度和对映体过量方面被证明是一种有用的酶。脂肪酶 F-AP 15 对两种底物都没有进行水解转化。用脂肪酶 AP 6 对含有直链烷基的 δ-acyloxyphosphonates 进行酶水解,可优先生成 (S)-δ-hydroxyalkylphosphonates 3。含有支链烷基的底物水解的对映选择性较低,(R)-酯比(S)-酯更容易被皂化。
ENZYMES IN ORGANIC CHEMISTRY, 8.<sup>[11</sup> PROTEASE-CATALYZED KINETIC RESOLUTION OF α-CHLOROACETOXYPHOSPHONATES IN A BIPHASIC SYSTEM
作者:Friedrich Hammerschmidt、Frank Wuggenig
DOI:10.1080/10426509808033735
日期:1998.10.1
Abstract Protease Chirazyme® P-2 hydrolysesracemic α-chloroacetoxyphosphonates (±1 enantiose-lectively to furnish α-hydroxyphosphonates (R)-(-)-2 with ee's ranging from 31 to 97% at a conversion of 45% and unreacted esters (S)-(+)-1.
Abramow; Kusnezow, Sb. Statei Obshch. Khim., 1953, p. 398,400
作者:Abramow、Kusnezow
DOI:——
日期:——
Enzymes in Organic Chemistry VI [1]. Enantioselective Hydrolysis of 1-Chloroacetoxycycloalkylmethylphosphonates with Lipase AP 6 from Aspergillus niger and Chemoenzymatic Synthesis of Chiral, Nonracemic 1-Aminocyclohexyl- methylphosphonic Acids
作者:Frank Wuggenig、Friedrich Hammerschmidt
DOI:10.1007/pl00000099
日期:1998.4
Racemic alpha-chloroacetoxyphosphonates derived from cycloalkanecarbaldehydes and three branched aldehydes were prepared and tested for kinetic resolution by lipase AP 6 which hydrolyses preferentially the (S) esters. The enantiomeric excess and the reaction rate are significantly influenced by the size of the cycloalkyl group. The optical antipodes of alpha-hydroxycyclohexylmethylphosphonates (3d; ee 90% and greater than or equal to 99%, respectively) were transformed into the corresponding alpha-aminophosphonic acids 6.
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