Table 1. Catalytic Michael addition reactions of 1,3-dimethylbabrbituric acid with different nitro-alkenes ^a .

Entry	R1	R2	Product	Time (min)	Yield b (%)
					Blank	With T2	With T1
1	1-Pyrenyl	H	4a	72 h	14	—	20
2	1-Naphthyl	H	4b	90	15	22	41
3	Ph	Me	4c	60	18	27	59
4	4-Me-Ph	H	4d	15	10	—	50
5	4-MeO-Ph	H	4e	30	13	20	54
6	2-Furanyl	H	4f	10	12	—	60

^aNitro-olefins 2 (0.02 mmol), 1,3-dimethylbarbituric acid 3 (0.02 mmol), catalyst T1 (2 mol%), and water (1 mL), at r.t. with stirring.

^bCrude yields were determined by ¹H NMR studies.