Table 2.

¹H and ¹³C NMR spectral data of the new compounds 13 and 14 in CDCl₃.

C/H	13		14
1	39.5 t	1.91 m 1.41 m	38.4 t	1.70 m 1.00 m
2	34.1 t	2.40 ddd (7.8, 4.6, 4.6) 2.50 ddd (7.8, 5.0, 5.1)	24.8 t	1.60 m 1.63 m
3	218.4 s	-	81.0 d	4.48 dd
4	47.2 s	-	37.6 s	-
5	54.7 d	1.32 m	55.3 d	0.78 m
6	19.6 t	1.45 m 0.80 m	18.9 t	1.45 m 1.50 m
7	33.8 t	1.43 m 1.44 m	34.5 t	1.48 m 1.39 m
8	41.2 s	-	41.4 s	-
9	49.6 d	1.34 m	50.2 d	1.28 m
10	36.7 s	-	37.8 s	-
11	21.9 t	1.33 m 1.46 m	21.4 t	1.48 m 1.34 m
12	27.5 t	1.02 m 1.89 m	27.5 t	1.00 m 1.51 m
13	40.3 d	1.42 m	37.0 t	0.99 m 1.68 m
14	43.5 s	-	43.5 s	-
15	27.5 t	1.51 m 1.74 m	27.5 t	1.70 m 1.51 m
16	35.4 t	1.48 m 1.34 m	35.5 t	1.39 m 1.40 m
17	44.6 s	-	44.7 s	-
18	47.9 d	1.40 m	48.0 d	1.40 m
19	47.3 d	1.93 m	47.3 d	1.91 m
20	75.2 s	-	75.2 s	-
21	28.6 t	1.05 m 1.52 m	27.9 t	1.51 m 1.04 m
22	37.7 t	1.73 m 1.75 m	40.4 t	1.10 m 1.32 m
23	26.6 q	1.06 s	28.6 q	0.85 s
24	21.0 q	1.02 s	16.5 q	0.84 s
25	16.0 q	0.94 s	16.2 q	0.87 s
26	16.0 q	1.08 s	16.2 q	1.05 s
27	14.7 q	0.92 s	14.8 q	0.94 s
28	18.9 q	0.80 s	18.2 q	0.80 s
29	67.2 t	3.44 d (10.3) 3.65 d (10.3)	67.3 t	3.44 d (10.3) 3.63 d (10.3)
30	24.8 q	1.20 s	23.7 q	1.20 s
-COCH3	-	-	171.0 s	-
-COCH3	-	-	21.3 q	2.03 s

The two protons at C-29 give their signals as doublets at ca. 3.40 and 3.60 ppm in both the compounds. The osmylation of 12 was completely stereoselective, giving rise to the new compound 14 as a single epimer. Similarly, compound 13 formed with a very high stereoselectivity (67% de, as established by ¹H NMR) as an inseparable mixture of epimers. The absolute stereochemistry of the major epimers of both 13 and 14 has not been ascertained.