Hydroborations: A new convenient route for the preparation of 4-alkyl- (or 4-aryl)chroman-3-ones from 4-alkyl- (or 4-aryl)-2H-chromenes

Article abstract of DOI:10.1055/s-1991-26598

Hydroboration followed by pyridinium chlorochromate oxidation of 4-alkyl- and 4-aryl-2H-chromenes [4-alkyl- and 4-aryl-(2H)1-benzopyrans] lead to the corresponding 4-substituted chroman-3-ones [4-substituted (2H)-1-benzopyran-3(4H)-ones] in good yields.