Bioactive Compounds from Medicinal Plants in Myanmar
187
O
OH
R
1
R
3
R
2
263 ((3R)-6,4'-dihydroxy-8-methoxyhomoisoflavan) R
1 = OMe,
R
2 = H, R
3 = OH
267 (6,4'-dihydroxy-7-methoxyhomoisoflavan) R
1 = H, R
2 = OMe,
R
3 = OH
268 (7,4'-dihydroxyhomoisoflavan) R
1 = R
3 = H,
R
2 = OH
O
OR
3
R
1
HO
R
2
O
269 (5,7-dihydroxy-4'-methoxyhomoisoflavanone)
R
1 = H, R
2 = OH, R
3 = OMe
270 (5,7,4'-trihydroxy-6-methoxyhomoisoflavanone)
R
1 = OMe, R
2 = OH, R
3 = H
271 (5,7,4'-trihydroxyhomoisoflavanone)
R
1 = R
3 = H, R
2 = OH
272 (7,4'-dihydroxyhomoisoflavanone)
R
1 = R
2 = R
3 = H
O
OH
O
R
2 O
R
1 O
264 (7-hydroxy-6-methoxy-3-(4'-hydroxybenzyl)coumarin) R
1 = Me, R
2 = H
265 (6-hydroxy-7-methoxy-3-(4'-hydroxybenzyl)coumarin) R
1 = H, R
2 = Me
Fig. 54 Structures of the homoisoflavans 263, 267, and 268, the homoisoflavanones 269–272, and
the 3-benzylcoumarins 264 and 265, isolated from a dichloromethane extract of S. febrifuga bark
grown in Myanmar
O
OH
R
2
R
1
HO
266 ((2R)-7,4'-dihydroxy-5-methoxy-8-methylflavan)
R
1 = Me, R
2 = OMe
273 (7,4'-dihydroxy-8-methylflavan) R
1 = Me, R
2 = H
274 (7,4'-dihydroxyflavan) R
1 = R
2 = H
O
O
OH
275 (4'-hydroxy-7-methoxyflavan)
O
HO
OH O
276 (5,7-dihydroxyflavanone)
Fig. 55 Structures of the flavans 266 and 273–275 and the flavanone 276, isolated from a
dichloromethane extract of S. febrifuga bark grown in Myanmar