Palladium(II)-catalysed asymmetric cyclisation of 2-allylphenols by the use of optically active β-pinene

Abstract
The palladium(II)-catalysed asymmetric cyclisation of 2-(but-2-enyl)phenol (1) to optically active 2,3-dihydro-2-vinylbenzofuran (3) can be achieved in 12% optical yield by using a catalytic amount of (–)-β-pinene, while in the presence of excess of β-pinene, cyclisation of (1) does not occur.

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