Mechanically activated ring-opening reactions of N-acyl-1,2,3,4-tetrahydroisoquinolines derived from the synthesis of praziquantel intermediate
作者:Jingbo Yu、Zhi Wang、Yang Zhang、Weike Su
DOI:10.1016/j.tet.2015.06.105
日期:2015.9
DDQ-promoted ring-openingreaction of N-chloroacetyl-tetrahydroisoquinoline under ball milling conditions was revealed during the synthesis of Praziquantel. A variety of N-acyl-tetrahydroisoquinolines were then tested to further investigate the reaction, and plausible reaction mechanism was proposed. Ball milling was demonstrated to be an efficient tool to promote this oxidative ring-openingreaction to give