Propargylic difluorides 1 were used as starting substrates in a combination of cross-enyne metathesis and Diels–Alder reactions. Thus, the reaction of 1 with ethylene in the presence of 2nd generation Hoveyda–Grubbs catalyst generates a diene moiety which in situ reacts with a wide variety of dienophiles giving rise to a small family of new fluorinated carbo- and heterocyclic derivatives in moderate to good yields. This is a complementary protocol to the one previously described by our research group, which involved the use of 1,7-octadiene as an internal source of ethylene.
Propargylic二氟代物1被用作起始底物,用于交叉烯烃酰胺和Diels–Alder反应的组合。因此,在2代Hoveyda–Grubbs催化剂存在下,1与乙烯反应生成二烯基团,该团在原位与各种烯丙基反应,产生一系列新的含氟碳和杂环衍生物,收率在中等到良好之间。这是我们研究小组之前描述的一个补充协议,该协议涉及将1,7-辛二烯用作乙烯的内部来源。