Organocatalytic Cascade Reaction of Aliphatic Enals and Benzoylnitromethane: Synthesis of Enantioenriched Tetrasubstituted Cyclohexene Carbaldehyde

Table 2

Correlations for compound Michael adduct 3c in the COSY spectrum.

Proton	δ (ppm)	Correlation
1	0.92	2 (1.44–1.31)
2	1.44–1.31	1 (0.92), 2 (1.44–1.31), 4 (2.76–2.68)
3	2.69–2.54	4 (2.71), 9 (9.77)
4	2.76–2.68	2 (1.44–1.31), 3 (2.69–2.54), 5 (4.44)
5	4.44	4 (2.76–2.68)
6	7.50–7.45	7 (7.63–7.59), 8 (8.13–8.10)
7	7.63–7.59	6 (7.50–7.45)
8	8.13–8.10	6 (7.50–7.45)
9	9.97	3 (2.69–2.54)