Synthesis of 4‘-Methyl and 4‘-Cyano Carbocyclic 2‘,3‘-Didehydro Nucleoside Analogues via 1,4-Addition to Substituted Cyclopentenones
作者:Louis S. Hegedus、Jeff Cross
DOI:10.1021/jo040215h
日期:2004.11.1
Carbocyclic 4‘-methyl and 4‘-cyano nucleoside analogues were synthesized using the Michael reaction to introduce the 4‘-substituent and Pd-catalyzed allylic substitution to introduce the nucleoside base. Use of both the desired β- and undesired α-1‘-carbonate diastereomers in the Pd-catalyzed substitution was demonstrated in principle by epimerization of the α-diastereomer and kinetic diastereodifferentiation
使用迈克尔反应合成碳环的4'-甲基和4'-氰基核苷类似物,以引入4'-取代基和Pd催化的烯丙基取代,以引入核苷碱基。原则上,通过α-非对映异构体的差向异构化和1'-碳酸酯的1:1α/β混合物的动力学非对映分化,证明了所需的β-和不希望的α-1'-碳酸非对映异构体在Pd催化取代中的使用。