Synthesis and diels-alder reactions of 5,5-dicyanocyclopentadiene: regioselective synthesis of 1,5-disubstituted-1,3-cyclohexadienes
作者:Gary I. Dmitrienko、Marc E. Savard、Richard W. Friesen、Mibbo S. Thandi
DOI:10.1016/s0040-4039(00)98312-6
日期:1985.1
, readily prepared in three steps from commercially available cis-1,4-dichloro-2-butene, undergoes Diels-Alder reactions with a number of dienophiles to give 5-substituted 7,7-dicyanobicyclo[2.2.1]hept-2-enes with high endo-selectivity. The adduct produced with methyl acrylate undergoes base-induced retro-Michael reactions to give 1-carbomethoxy-5-dicyanomethyl-1,3-cyclohexadiene.
由市售的顺式1,4-二氯-2-丁烯分三步制备的5,5-二氰基环戊二烯易于与许多亲二烯体进行狄尔斯-阿尔德反应,得到5-取代的7,7-二氰基双环[2.2.1]内选择性高的] hept-2-enes。由丙烯酸甲酯产生的加合物经历碱诱导的逆迈克尔反应,得到1-羰甲氧基-5-二氰基甲基-1,3-环己二烯。