作者:Vera L. M. Silva、Artur M. S. Silva、Diana C. G. A. Pinto、José A. S. Cavaleiro、Attila Vasas、Tamás Patonay
DOI:10.1007/s00706-008-0926-0
日期:2008.11
Several ( E )- and ( Z )-3-styrylchromones were prepared by two different methodologies, the Wittig reaction of chromone-3-carboxaldehyde with benzylic ylides and the Knoevenagel condensation of chromone-3-carboxaldehyde with phenylacetic acids in the presence of potassium tert -butoxide under microwave irradiation. The Knoevenagel reaction followed by a decarboxylation offered an efficient and diastereoselective
通过两种不同的方法制备了几种( E )-和( Z )-3-苯乙烯基色酮,在钾存在下,色酮3-甲醛与苄基的 Wittig 反应以及色酮3-甲醛与苯乙酸的 Knoevenagel 缩合。 微波辐射下的 叔 丁醇盐。的 诺文葛耳 反应,然后脱羧提供了一个有效的和非对映选择性制备方法( Ë )-3-苯乙烯基色酮在较短的反应时间内。还证明了苯基乙酸也可以成功地被苯基丙二酸取代。通过NMR实验确定所有产物的立体化学。
Synthesis of (E)- and (Z)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles
作者:Vera L. M. Silva、Artur M. S. Silva、Diana C. G. A. Pinto、José A. S. Cavaleiro、José Elguero
DOI:10.1007/s00706-008-0002-9
日期:2009.1
AbstractAn efficient synthesis method for the preparation of a series of new (Z)- and (E)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles was developed. The reaction of (Z)- and (E)-3-styrylchromones with hydrazine hydrate afforded the corresponding (Z)- and (E)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles, except for nitro derivatives, where both (Z)- and (E)-4′-nitro-3-styrylchromones afforded (E)-3(5)-(2-hydroxyph