Table 2.

¹H-NMR data of compounds 1–5.

Comp.	Solvent	δNH	δHB	1J(C,HB)	δHA	1J(C,HA)	2J(H,H)
1a	CDCl3	6.35	4.89	159	4.51	157	11.5
	DMSO	9.44	4.69		4.40		9.6
1b	CDCl3		4.96		4.82		11.0
	DMSO		5.17		4.87		11.3
1c	CDCl3	6.49	4.81	159	4.66	157	11.6
	DMSO	9.67	4.61	158	4.56	157	9.9
1d	CDCl3	6.55	4.86		4.57		11.8
	DMSO	9.62	4.67		4.53		9.7
1e	CDCl3	7.37	5.19	160	4.74	158	14.6
	DMSO	9.78	4.93	158	4.48	156	11.1
1f	CDCl3	6.45	4.91	159	4.63	156.4	11.8
	DMSO	9.58	4.67	160	4.57	158.7	9.6
1g	CDCl3	6.56	4.86		4.62		11.3
	DMSO	9.65	4.62		4.59		9.7
1h	CDCl3	6.45	4.92	158	4.63	156	11.5
	DMSO	9.62	4.68	159	4.59	157	9.7
1i	CDCl3		4.91		4.84		11.0
	DMSO		5.18		4.85		11.4
2a	CDCl3	10.88	6.28		5.76		14.1
	DMSO	10.10	5.99		5.49		15.0
2b	CDCl3		6.82	152.1	6.59	146.3	15.6
	DMSO		6.45	152.2	5.77	146.2	16.0
2c	CDCl3	10.98	6.35	153.1	5.97	147.1	13.6
	DMSO	10.48	5.97	151.1	5.66	149.1	15.1
2d	CDCl3	10.80	6.16		6.11		14.1
	DMSO	10.15	5.90	150.1	5.62	149.2	14.9
2e	CDCl3	10.31	6.30		6.06		14.1
	DMSO	10.20	5.97		5.64		15.6
2f	CDCl3	10.92	6.38	150.6	5.92	146.5	13.6
	DMSO	10.34	6.08	151.9	5.63	146.4	15.3
2g	CDCl3	10.88	6.24		6.10		13.7
	DMSO	10.31	5.94		5.46		14.9
2h	CDCl3		6.84		6.62		15.8
	DMSO		6.39		5.77		16.2
3a	CDCl3	10.96	6.40	150.7	5.89	146.5	13.9
	DMSO	10.21	6.08	151.1	5.56	145.4	15.1
3b	CDCl3	10.95	6.40	151.4	5.89	146.3	13.9
	DMSO	10.12	6.07	152.4	5.53	146.3	15.0
3c	CDCl3	10.92	6.32	150.1	5.86	146.2	13.8
	DMSO	10.28	6.08	152.1	5.56	146.4	15.1
3d	CDCl3	10.96	6.40	148.3	5.89	146.2	13.9
	DMSO	10.12	6.07		5.53		15.2
3e	CDCl3		6.73	152.5	6.56	150.2	16.1
	DMSO		6.48	152.5	5.78	147.5	16.5
4a	CDCl3	8.30	4.52	and	4.47		16.7
	DMSO	9.74	4.84	and	4.74		16.5
4f	CDCl3	6.42	4.69	and	4.65		16.4
5a	DMSO	9.91	4.72	and	4.65		16.0
5f	DMSO	9.97	4.64	and	4.60		16.2