Enantioselective synthesis of 4,5,6,7-tetrahydro-4-oxo-benzofuran-5-yl acetate and 1-benzyl-4,5,6,7-tetrahydro-4-oxo-1(H)-indol-5-yl acetate using chemoenzymatic methods


Demir A. S. , Caliskan Z., Sahin E.

JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC, vol.44, pp.87-92, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44
  • Publication Date: 2007
  • Doi Number: 10.1016/j.molcatb.2006.09.006
  • Title of Journal : JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
  • Page Numbers: pp.87-92
  • Keywords: manganese(III) cetate, indole, benzofurane, enzymatic resolution, oxidation of enone, 4-OXO-4,5,6,7-TETRAHYDROINDOLES, INDOLES, SUBSTITUENTS, ENANTIOMERS, ENONES

Abstract

The chemoenzymatic synthesis of both of the enantiomers of pharmacologically interesting compounds such as 4,5,6,7-tetrahydro-4-oxobenzofuran-5-yl acetate (2a), 4,5,6,7-tetrahydro-4-oxo-6,6-dimethylbenzofuran-5-yl acetate (2b), and their hydroxy derivatives 3a, 3b, 1-benzyl4,5,6,7-tetrahydro-4-oxo-1(H)-indol-5-yl acetate (5), starting from 6,7-dihydrobenzofuran-4(5H)-one (la), 6,7-dihydro-6,6-dimethylbenzofuran4(5H)-one (7b), and 1-benzyl-6,7-dihydro-1 H-indol-4(5H)-one (4) are reported. Manganese(III) acetate-mediated acetoxylation followed by the enzyme-mediated kinetic resolution of alpha'-acetoxy enone provides acetoxy and hydroxy derivatives in good yields and high enantiomeric excesses. (c) 2006 Elsevier B.V. All rights reserved.