Stereocontrolled Synthesis of Triazacyclopenta[<i>cd</i>]pentalenes by Intramolecular 1,3-Dipolar Cycloaddition Reactions of Azomethine Imines
作者:Guillaume Bélanger、Fang-Tsao Hong、Larry E. Overman、Bruce N. Rogers、John E. Tellew、William C. Trenkle
DOI:10.1021/jo026282y
日期:2002.11.1
The construction of triazacyclopenta[cd]pentalene diesters 6 by the reaction of dihydropyrrole alpha-ketoesters 3 with acylated hydrazines was evaluated further as a potential central strategic step in the total syntheses of complex guanidine alkaloids such as palau'amine and styloguanidine. Successful cyclocondensations were realized with acid-stable 2,2,2-trichloroethyl carbazate and thiosemicarbazide