Synthesis and reactions of some new allyl furobenzopyranone derivatives
作者:El-Sayed I. El-Desoky
DOI:10.1002/jhet.5570440612
日期:2007.11
Reaction of visnaginone 1 with allyl bromide gave O-allyl visnaginone 2 which underwent Claisen rearrangement to yield 7-allylbenzofuran derivative 3. Reaction of 3 with different aromatic aldehydes gave the corresponding 5-cinnamoylbenzofuran derivatives 4a-d. Condensation of the latter chalcones 4a,c,d with hydrazine hydrate and phenylhydrazine provided, the corresponding pyrazoline derivatives 7a-f