Table 3.

NMR Spectroscopic Data for the Hydrogenation Product of Pyridinopyrone B (600 MHz for ¹H, 150 MHz for ¹³C in acetone-d₆)^a

C#	δC	δH mult (J in Hz)	COSY	HMBC c
1	164.5, C
2	99.3, C
3	166.0, C
4	94.2, CH	6.39, s		2, 3, 5, 6
5	164.3, C
6	33.3, CH2	2.51, t (7.8)	7	4, 5, 7, 8
7	27.1, CH2	1.64, mb	6, 8	5, 6, 8, 9
8	26.1, CH2	1.34, mb	7, 9	6, 7, 9, 10
9	36.2, CH2	1.16, 1.35, mb	8, 10	7, 8, 10, 11, 10-CH3
10	32.1, CH	1.45, m	9, 11	8, 9, 11, 10-CH3
11	36.2, CH2	1.16, 1.35, mb	10, 12	9, 10, 12, 13 10-CH3
12	28.3, CH2	1.60, mb	11, 13	10, 11, 13, 3'
13	32.5, CH2	2.61, m	12	11, 12, 2', 3', 4'
2'	150.2, CH	8.45, s		13, 3', 4', 6'
3'	137.8, C
4'	135.5, CH	7.61, d (7.8)	5'	13, 2', 6'
5'	123.3, CH	7.27, dd (7.8, 4.2)	4', 6'	3', 6'
6'	147.3, CH	8.40, d (4.2)	5'	2', 4', 5'
2-CH3	7.6, CH3	1.80, s		1, 2, 3
3-OCH3	55.9, CH3	3.94, s		3
10-CH3	19.1, CH3	0.87, d (7.2)		9, 10, 11

^aAssignments made by interpretation of COSY, HSQC and HMBC data.

^bSignals obscured by overlap,

^cHMBC correlations are from the proton(s) stated to the carbon indicated.