Synthesis of 2-alkyl-1,4-naphthoquinones by alkylboration

Article abstract of DOI:10.1055/s-1992-26136

By reaction of 1,4-naphthoquinone (1) and trialkylboranes in the presence of oxygen and oxidative work-up, sterically hindered 2-alkyl-1,4-naphthoquinones and, on addition of magnesium bromide, 2,3-bisalkyl-1,4-naphthoquinones are obtained.