2-(2'-bromo-beta-phenethyl)isoquinolinium bromides 6 and their nor- and homoanalogues (10,11) induced 6-, 5-, and 7-exo radical closures in a one-pot manner to give protoberberines 2, dibenzo[b,g]indolizidine 14a and, dibenzo[a, h]-1-azabicyclo[5.4.0]undecane 15a, respectively. A one-pot radicalcyclization of 1-(2'-bromobenzyl)isoquinoline methiodide 18a gave a pavine alkaloid, (+/-)-algemonine (19a).
An efficient synthesis of argemonine, a pavine alkaloid
作者:Somsak Ruchirawat、Anucha Namsa-aid
DOI:10.1016/s0040-4039(00)02233-4
日期:2001.2
A method for the synthesis of 1,2-dihydroisoquinoline derivatives is described and the conversion of the 1,2-dihydroisoquinoline intermediate to a pavinealkaloid via palladium-induced intramolecular hydroarylation reaction and radical cyclization is presented.