Isolation and Biological Evaluation of Prenylated Flavonoids from Maclura pomifera

Table 1

¹H NMR data of compounds I–IV.

Proton	^aCompound I	^aCompound II	^aCompound III	^bCompound IV
2	8.37 (s)	8.31 (s)	8.10 (s)	8.42 (s)
2′	6.76 (m)	7.00 (s)	6.79 (d, 8.4)	6.81 (s)
3′	-	-	7.30 (d, 8.4)	-
5′	6.99 (s)	6.93 (d, 1.8)	7.30 (d, 8.4)	7.03 (d, 1.9)
6′	6.76 (m)	6.79 (d, 1.8)	6.79 (d, 8.4)	6.80 (d, 1.9)
1′′	6.63 (d, 10.0)	-	2.79 (dd, 5.6, 17.0), 2.43 (dd, 5.6, 17.0)	6.63 (d, 10.0)
2′′	5.78 (d, 10.0)	4.52 (s)	3.66 (dd, 5.6, 7.1)	5.82 (d, 10.0)
4′′	1.43 (s)	4.77 (s), 4.67 (s)	1.30 (s)	1.44 (s)
5′′	1.41 (s)	1.74 (s)	1.20 (s)	1.43 (s)
1′′′	2.75 (d, 5.4)	5.77 (d, 10.0)	5.73 (d, 9.9)	4.54 (d, 7.3)
2′′′	3.47 (m)	6.66 (d, 10.0)	6.68 (d, 9.9)	3.65 (d, 7.3)
4′′′	1.13 (s)	1.46 (s)	1.45 (s)	1.19 (s)
5′′′	1.21 (s)	1.46 (s)	1.44 (s)	1.06 (s)
OMe	3.19 (s)	-	-	3.22 (s)

^aData acquired at 500 MHz. ^bData acquired at 400 MHz.