Pd(0)-catalysed coupling between various furyl zinc or tin compounds and vinyl iodides is demonstrated to be a versatile method for the synthesis of 2,3-dialkyl-5-alkenylfurans like 3, as potential precursors of the ring system of lophotoxin and pukalide. A possible cyclisation substrate was successfully prepared by glycol cleavage, 21 → 24, when alcohol oxidation failed.
Pd(0)催化的各种
呋喃基
锌或
锡化合物与
乙烯基碘之间的偶联是合成2,3-二烷基-5-链烯基
呋喃(如3)的一种通用方法,可作为Lophotoxin和Rn环系统的潜在前体。普卡利德。当
乙醇氧化失败时,通过
乙二醇裂解21 → 24成功制备了可能的环化底物。