A regiospecific synthesis of protoberberine alkaloids
…, J Poplawski, BC Nalliah, DB MacLean
文献索引:Kiparissides, Zinovia; Fichtner, Robert H.; Poplawski, Janusz; Nalliah, Bala C.; MacLean, David B. Canadian Journal of Chemistry, 1980 , vol. 58, p. 2770 - 2779
The protoberberine skeleton has been prepared in two steps from N-benzyl-3, 4- dihydroisoquinolinium salts. Treatment of the salts with the anion of methyl methylthiomethylsulfoxide yields mixtures of diastereomeric adducts that cyclize on heating with concentrated hydrochloric acid to dihydroprotoberberines. The latter compounds may be reduced to their tetrahydro analogues with sodium borohydride, oxidized to ...