Chemoenzymatic synthesis of 2-substituted 2-fluoro-1,3-dioxygenated chiral building blocks
摘要:
A series of 2-substituted-2-fluoro-1,3-dioxygenated chiral building blocks are synthesized via a chemoenzymatic route using either (i) lipase catalyzed monohydrolysis of suitably functionalized malonic diesters, or (ii) lipase catalyzed monoacetylation of suitably functionalized 1,3-propanediols. (C) 1999 Elsevier Science Ltd. All rights reserved.
Lipase mediated preparation of differently protected homochiral 2-aryl-2-fluoro-1,3-propanediols
摘要:
Lipase mediated asymmetric monohydrolysis of 2-aryl-2-fluoromalonic acid diesters or monoacetylation of 2-aryl-2-fluoro-1,3-propanediols affords chiral fluorinated polyfunctionalized C-3 synthons in excellent enantiomeric excess and acceptable chemical yields. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
can reductively desymmetrize a large collection of easily available halomalonic esters to α-halo-β-hydroxyesters. These polyfunctionalized tertiary alkyl fluorides, chlorides, and bromides proved to be useful intermediates toward fluorinated drug analogs and polyhalogenated monoterpenes. The facile intramolecularepoxidation of the chiral chloride and bromide products has also enabled expeditious access