Four New Natural Diels-Alder Type Adducts, Mulberrofuran E, Kuwanon Q, R, And V From Callus Culture of Morus Alba L

Abstract

From callus tissues of Morus alba L. the four new Diels-Alder type adducts mulberrofuran E (3), kuwanon Q (4), R (5), and V (6) have been isolated. Their structures were established by chemical and spectroscopic means. Mulberrofuran E (3) was found to be an adduct of a chalcone and a dehydropreny1-2-arylbenzofuran, whereas kuwanon Q (4), R ( 5), and V (6) were identified as adducts of two prenylchalcone derivatives. © 1984, The Pharmaceutical Society of Japan. All rights reserved.