Enantioselective Total Syntheses of 13,14,15-Isocrambescidin 800 and 13,14,15-Isocrambescidin 657
作者:D. Scott Coffey、Larry E. Overman、Frank Stappenbeck
DOI:10.1021/ja000235a
日期:2000.5.1
The first total syntheses of 13,14,15-isocrambescidin800 (1) and 13,14,15-isocrambescidin 657 (2) were accomplished in convergent fashion. The central strategic step was tethered Biginelli condensation of guanidine aminal 14 and β-ketoester 15 to give 1-iminohexahydropyrrolo[1,2-c]pyrimidine carboxylic ester 16. This step united all the heavy atoms of the pentacyclic guanidine nucleus and set the