Three New Steroidal Glycosides from the Roots of Cynanchum stauntonii

Table 1

The ¹H NMR chemical shifts of the sugar moieties of compounds 1–3 in C₅D₅N (δ in ppm, J values in Hz).

H	1 ^a	2 ^a	3 ^b
	β-D-the	β-D-the	β-D-the
1′	4.81 d(7.5)	4.82 d(8.0)	4.90 d(7.8)
2′	3.93	3.94	3.99
3′	3.68	3.71	3.67
4′	3.72	3.70	3.67
5′	3.66	4.21	3.77
6′	1.45 d(6.5)	1.46 d(6.0)	1.62 d(6.0)
3′-OCH3	3.94 s	3.94 s	3.92 s
	β-D-digt	β-D-digt
1′′	5.51 dd(9.5,1.5)	5.52 d(10.0)
2′′	1.68, 2.35	2.01, 2.43
3′′	3.71	4.64
4′′	3.49	3.48 dd(9.5,2.5)
5′′	4.30	4.31
6′′	1.42 d(6.5)	1.42 d(6.0)*
3′′-OCH3
	β-D-cym	β-D-cym
1′′′	5.11 dd(10.0,1.5)	5.13 d(9.5)
2′′′	2.00, 2.42	1.67, 2.40
3′′′	4.64	3.92
4′′′	3.47	3.39 dd(9.5,2.5)
5′′′	4.11	3.67
6′′′	1.46 d(6.0)	1.30 d(6.5)
3′′′-OCH3	3.44 s	3.52 s
		α-L-cym
1′′′′		5.19 d(3.5)
2′′′′		2.07, 2.38
3′′′′		3.85
4′′′′		4.06
5′′′′		4.31
6′′′′		1.56 d(6.5)*
3′′′′-OCH3		3.31 s

* Not differentiated.
^a500 MHz; ^b600 MHz.
the: thevetopyranosyl; digit: digitoxopyranosyl; cym: cymaropyranosyl.