Photochemical cyclisation of β-allyloxy-carbonyl compounds: synthesis of 2-alkenyl-3-hydroxytetrahydrofurans

Abstract
The β-allyloxy-ketones (1) and (6) undergo cyclisation on u.v. irradiation to yield the 2-alkenyl-3-hydroxytetrahydrofurans (2), (3), and (7)–(10); similar cyclisation of the aldehyde (12) has been used in a dihydrofuran-3(2H)-one synthesis.

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