title: Efficient synthesis of 5'-O-laurate of 1-beta-D-arabinofuranosylcytosine via highly regioselective enzymatic acylation in binary solvent mixtures.
abstract: Regioselective enzymatic acylations of 1-beta-D-arabinofuranosylcytosine (ara-C) with vinyl laurate (VL) in binary organic solvents were explored for the preparation of 5'-O-laurate of ara-C. Among the nine kinds of enzymes, Novozym 435 showed the highest regioselectivity (>99.9%) towards the 5'-OH of ara-C. This lipase showed higher catalytic activity in hexane-pyridine than in other tested solvent mixtures. The most suitable VL to ara-C molar ratio, initial water activity, and reaction temperature were shown to be 15:1, 0.07, and 50 degrees C, respectively, under which the initial reaction rate and the maximum substrate conversion were as high as 84.0 mmol L(-1) h(-1) and 98.1%, respectively. The product of Novozym 435-catalyzed acylation was characterized by (13)C NMR and confirmed to be 5'-O-laurate of ara-C.
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510641, China.
authors.forename: Xiao-feng
authors.initials: XF
authors.lastname: Li
authors.forename: Min-hua
authors.initials: MH
authors.lastname: Zong
authors.forename: Guang-lei
authors.initials: GL
authors.lastname: Zhao
mesh_terms: D000215:Acylation; D002384:Catalysis; D003561:Cytarabine / Q000138:chemical synthesis* / Q000737:chemistry; D004798:Enzymes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D004798:Enzymes; D012997:Solvents; D003561:Cytarabine