Concise syntheses of (±)-protoemetinol and related alkaloids using radical cyclisation
作者:Matthew J. Palframan、Andrew F. Parsons、Paul Johnson
DOI:10.1016/j.tetlet.2011.01.007
日期:2011.3
Both (±)-protoemetinol, its 3-epi-isomer and (±)-3-desmethyl protoemetinol have been prepared in five linear steps from a dihydroisoquinoline using a 6-exo-trig cyclisation of a vinyl radical in the key step. This novel and particularly short route has potential application in the synthesis of Alangium and Mitragyna alkaloids.