An Expedient Protocol to the Synthesis of Benzo(b)furans by Palladium Induced Heterocyclization of Corresponding 2-Allylphenols Containing Electron Rich and Electron Capturing Substituents in the Arene Ring

Table 1

Reactions' conditions^a used for the Pd(II) induced cyclisation of the 2-allylphenols to benzo(b) furans.

	Stoichiometric cyclization (A)	Catalytic cyclization (B)
PdCl2(CH3CN)	1.0 equiv.	0.1 equiv.
Triethylamine	3.0 equiv.	—
Benzoquinone	—	1.0 equiv.
Lithium chloride	—	1.0 equiv.
Solvent	THF	THF

^aThe reactions were run in THF at 0.05 M.