Study of Catalytic Hydrogenation and Methanol Addition to α-Methylene-γ-Lactone of Eremanthine Derivatives

Table 1

Selected chemical shifts for the hydrogens and carbons of compounds 20, 22, 23, 26, 27, 8a and 8c.

Compound	Hydrogens [δ (Multiplicity, J/Hz)]						^13C (sp^2) δ	^13C (sp^3) δ (Position)
	H-5	H-6	H-9	H-13	H-14	H-15
	3.57 (m)	4.14 (t, 10.0)	4.50–4.20 (m)	1.30–1.00 (m)	1.86 (sl)	5.40–5.30 (m)	144.00	89.98 (C-6)
	2.89 (m)	4.05–3.85 (m)			1.81 (sl)	1.30–1.00 (m)	138.25	86.49 (C-6)
	2.63 (m)	4.04 (t, 9.2)			1.69 (sl)		131.25	86.28 (C-6)
20, 22, 23,	2.50 (m)	3.81 (t, 9.5)			0.91 (d, 7.1)			85.85 (C-6)
26, 27, 8c		3.65 (m)						83.10 (C-6)
								83.00 (C-6)
								77.64 (C-9)
								77.00 (C-9)
								73.67 (C-9)
8a	—	3.72 (dd, 9.7, 9.9)	—	1.14 (d, 6.9)	0.91 (d, 7.1)	1.09 (d, 6.4)	182.15	89.07 (C-6)