A palladium-catalyzed heck-type cascade cyclization of (Z)-1-iodo-1,6-dienes with N-tosyl hydrazones is reported. The alkylpalladium intermediate coupled with the diazo compound, generating the second alkylpalladium species bearing two β-H, which generated a terminal alkene as the major products in the anti-Zaitsev way via the highly regioselective β-H elimination. It provided a new way to synthesize tetrahydropyridine derivatives bearing a terminal alkene.

中文翻译：

---

钯催化的N-甲苯磺酰基的（Z）-1-碘-1,6-二烯的钯催化的heck型级联环化

报道了钯催化的N-甲苯磺酰基对（Z）-1-碘-1,6-二烯的钯催化的heck型级联环化。烷基钯中间体与重氮化合物偶联，生成带有两个β-H的第二个烷基钯物种，后者通过高度区域选择性的β-H消除，以反Zaitsev方式生成末端烯烃作为主要产物。它提供了一种合成带有末端烯烃的四氢吡啶衍生物的新方法。