Table 1.

A Tandem 1,3-H–1,7-H Shift–Pericyclic Ring-Closure.

^aAll 3-amido-trienes 11b–e were attained from the respective allenamides 10b–e via 1,3-H shift promoted by CSA (10 mol %). Reactions were run in CH₂Cl₂ at rt for 10 min, and isolated yields are shown in the respective brackets.

^bFor all entries: concn = 0.10 M; temp = 135 °C; time = 20 h.

^cIsolated yields.

^dRatios determined by ¹H and/or ¹³C NMR.