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
摘要:
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, 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.