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
visnaginone 1与烯丙基溴的反应生成O-烯丙基visnaginone 2,将其进行克莱森重排,得到7-烯丙基苯并呋喃衍生物3。3与不同的芳族醛反应,得到相应的5-肉桂酰基苯并呋喃衍生物4a-d。提供的后一查耳酮4a,c,d与水合肼和苯肼缩合,得到相应的吡唑啉衍生物7a-f。化合物3与乙酸乙酯和碳酸二乙酯的克莱森缩合得到克莱森加合物8和12容易环化成9和13,并具有有趣的生物学特性。