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Stereoselective enzymatic hydrolysis of 2-cyclohexyl-and 2-phenyl-1,3-propanediol diacetate in biphasic systems

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Summary

A key intermediate (S(−) 2-cyclohexyl-1,3-propanediol monoacetate) was made with high optical purity for the total synthesis of a new angiotensin converting enzyme inhibitor, Fosinopril. The stereoselective hydrolysis of 2-cyclohexyl-1,3-propanediol diacetate (I) and 2-phenyl-1,3-propanediol diacetate (II) was carried out with lipases. Among various lipases evaluated, only porcine pancreatic lipase (PPL) and Chromobacterium viscosum lipase demonstrated efficient conversion and gave the desired enantiomer of monoacetate. In aqueous solution, the desired S(−) monoacetate exhibited an optical purity of 65%–80% (30%–60% enantiomeric excess [e.e.]). However, when the same reactions were conducted in a biphasic system, the product S(−) monoacetate exhibited an optical purity of 99%–100% (98%–100% e.e.). The high purity product was achieved with 65 mol% yield at 1% substrate concentration. Among various solvents evaluated in biphasic systems, efficient hydrolysis was achieved in toluene, cyclohexane, and trichloro-trifluoroethane. The crude PPL was partially purified and two lipase fractions (A and B) were identified. Lipases A and B had a molecular mass of 38 000 and 40 000 daltons, respectively, and both were found to catalyze the hydrolysis of I and II to the appropriate monoacetate in a biphasic system.

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Patel, R.N., Robison, R.S. & Szarka, L.J. Stereoselective enzymatic hydrolysis of 2-cyclohexyl-and 2-phenyl-1,3-propanediol diacetate in biphasic systems. Appl Microbiol Biotechnol 34, 10–14 (1990). https://doi.org/10.1007/BF00170915

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  • DOI: https://doi.org/10.1007/BF00170915

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