Synthesis of Pyranoisoflavones from Pyronochalcones: Synthesis of Elongatin and Its Angular Isomer
作者:Masao Tsukayama、Yasuhiko Kawamura、Hiroto Tamaki、Tomoya Kubo、Tokunaru Horie
DOI:10.1246/bcsj.62.826
日期:1989.3
6H-benzo[1,2-b:5,4-b′]dipyran-4,6-dione with sodium boronydride–palladium chloride, followed by dehydration of the resultant alcohol and hydrolysis. Its angular isomer (4′,5-dihydroxy-2′,5′-dimethoxy-2″,2″-dimethylpyrano[6″,5″-h]isoflavone) was also synthesized from the corresponding pyronochalcone in a similar manner.
Elongatin(4',5-二羟基-2',5'-二甲氧基-2",2"-二甲基吡喃[5",6"-g]异黄酮)是通过相应吡喃查尔酮[6-(1 -oxo-3-phenyl-2-propenyl)-4-chromanone] 与硝酸铊 (III) 和 7-(4-苯甲酰氧基-2,5-二甲氧基苯基)-2,3-二氢-2,2 的区域选择性还原-二甲基-5-甲苯磺酰氧基-4H,6H-苯并[1,2-b:5,4-b']二吡喃-4,6-二酮与硼氢化钠-氯化钯,然后将所得醇脱水并水解。其角异构体(4',5-二羟基-2',5'-二甲氧基-2",2"-二甲基吡喃[6",5"-h]异黄酮)也以类似的方式由相应的吡喃查耳酮合成。