Abstract
A synthesis of novel pterocarpans ( 8a–e, 10a–c and 11a–e) and pterocarpenes ( 7a–d and 9a–c) has been carried out. This method involves the Lewis acid Ti (IV) promoted formal (3+2) cycloaddition reaction of 2-alkoxy-1,4-benzoquinones ( 6a–c) with appropriately substituted 2 H-chromenes ( 1a–b, 2a–b and 5) at −78°C.
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