A two-step four-component queuing cascade involving a Heck coupling, π-allylpalladium trapping and Diels–Alder reaction
作者:Baris Yücel、Lars Arve、Armin de Meijere
DOI:10.1016/j.tet.2005.09.014
日期:2005.11
allylidenecyclopropanes 13 which undergo immediate Diels–Alder reactions upon addition of dienophiles 14–18 to provide 8-(1′-aminoethyl)-substituted spiro[2.5]oct-7-ene derivatives 23a–26a in 29–66% yield. The same one-pot, two-step queuing cascade can be carried out with other iodoalkenes including cyclic ones and with cyclic dienophiles such as N-arylmaleinamides 19–22 and N-phenyl-triazolinedione 37 to furnish
钯催化bicyclopropylidene(的交叉偶联1)与iodoethene(11在仲胺的存在下)12提供allylidenecyclopropanes 13在添加亲双烯体的立即接受狄尔斯-阿尔德反应14 - 18提供8-(1'-氨基乙基)取代的螺[2.5] oct-7-ene衍生物23a - 26a,收率29-66%。相同的一锅,两步排队级联可以与其他iodoalkenes包括环状的,并与环状亲双烯体,例如来进行Ñ -arylmaleinamides 19 - 22和Ñ苯基triazolinedione37提供高度取代的螺[2.5]辛-4-烯和螺环丙烷化的杂环杂环47a – 49a,41a – 46a(17–50%)。Spirocyclopropanated heterobicycles如55,56(25和38%的产率,分别地)也可以通过一个跨帧内帧内分子间版本涉及1-羟乙基和这个排