¹H NMR data of compounds 1–8 (600 MHz).

No.	1b	2a	3b	4a	5a	6b
1	2.05, dd (11.8, 3.5), 1.37, d (11.8)	1.77, dd (10.0, 2.5), 1.80, dd (10.0, 2.5)	2.01, dd (11.5, 4.5), 1.87, d (11.5)	2.79, dd (11.0, 5.0), 1.42, d (11.0)	1.67, dd (11.8, 4.5), 1.60, d (11.8)	1.59, ddd (12.0, 5.0, 2.8), 2.11, d (12.0)
2	2.59, d (3.5)	1.61, t (2.5)	2.11, d (4.5)	2.61, d (5.0)	2.51, d (4.5)	1.85, d (5.0)
4	6.73, t-like (2.5)	1.86, overlapped, 1.48, ddd (16.8, 7.6, 5.2)	6.04, br. s	6.80, dd (4.0, 3.0)	6.88, d (4.0)	3.31, dd (11.2, 6.3)
5	2.55, dd (22.0, 2.5), 2.24, dd (22.0, 2.5)	1.84, overlapped, 1.32, ddd (16.8, 13.3, 8.0)		2.49, dd (21.0, 4.0), 2.16, dd (21.0, 3.0)	3.95, d (4.0)	1.82, dd (14.0, 6.3), 1.46, dd (14.0, 11.2)
8	1.50, m, 1.23, m	5.65, d (5.8)	1.46, m, 1.17, overlapped	2.22, ddd (14.0, 9.5, 8.0), 1.64, ddd (14.0, 6.0, 4.0)	3.74, overlapped	2.61, d (19.7), 1.89, d (19.7)
9	1.76, m, 1.61, m	5.60, dd (5.8, 2.1)	1.53, m, 1.43, m	1.60, m, 1.54, m	1.74, m
10	3.67, t-like (5.0)	4.11, d (2.1)	1.59, overlapped, 1.36, m	1.69, ddd (14.0, 7.0, 4.0), 1.25, m	1.27, m, 1.14, overlapped	3.00, d (19.8), 2.13, d (19.8)
12	1.06. s	1.11, s	1.17, s	1.21, s	1.12, s	1.22, s
13	0.94, s	0.97, s	0.98, s		1.05, s	1.01, s
14	0.99, s	0.94, s	1.07, s	1.13, s	0.93, s	0.90, s
15	9.45, s	3.43, d (10.0), 3.27, d (10.0)	4.35, br. dd (17.0, 6.0), 4.25, br. dd (17.0, 6.0)			1.38, s
MeO-					3.74, s

^aMeasured in CD₃OD.

^bMeasured in CDCl₃.