Photochemistry of α-keto-imines: a novel synthesis of xylopinine
Abstract
Irradiation of 1-(2-methyl-4,5-dimethoxybenzoyl)-3,4-dihydro-6,7-dimethoxyisoquinoline in methanol gave a water soluble berberine salt which, on reduction with sodium borohydride, afforded (±)-xylopinine in 55% yield.