An efficient synthesis of 7-hydroxy-2,6-dimethylchromeno[3,4-d]oxazol-4-one—a protected fragment of novenamine
作者:David W. Gammon、Roger Hunter、Seanette A. Wilson
DOI:10.1016/j.tet.2005.08.083
日期:2005.11
The high-yielding six-step synthesis of 7-hydroxy-2,6-dimethylchromeno[3,4-d]oxazol-4-one 17 from commercially available 2,4-dihydroxy-3-methylacetophenone is described. Coumarin 17 constitutes a useful synthon for cournarin antibiotic synthesis. A new methodology for oxazole formation applicable to 3-aminocournarins has been developed, and a mechanistic rationalization is proposed. (c) 2005 Published by Elsevier Ltd.