Table 1.

Synthesis of 3a under different reaction conditions.

Entry	Solvent	Time (min)	Reaction Temperature (°C)	Power(W)	Pressure (psi)	Yield (%)
1	isopropanol/acetic acid (v/v,4:1)	20	100	100	100	59.0
2	acetonitrile/acetic acid (v/v, 4:1)	20	100	100	100	40.1
3	chloroform/acetic acid (v/v, 4:1)	20	100	100	100	43.9
4	isopropanol/acetic acid (v/v, 4:2)	20	100	100	100	51.3
5	isopropanol/acetic acid (v/v, 4:1)	10	100	100	100	45.1
6	isopropanol/acetic acid (v/v, 4:1)	30	100	100	100	62.5
7	isopropanol/acetic acid (v/v, 4:1)	20	130	100	130	69.6
8	isopropanol/acetic acid (v/v, 4:1)	20	150	100	150	79.0
9	isopropanol/acetic acid (v/v, 4:1)	20	170	100	170	77.0
10	isopropanol/acetic acid (v/v, 4:1)	20	150	60	100	43.0
11	isopropanol/acetic acid (v/v, 4:1)	20	150	80	100	70.0
12	isopropanol/acetic acid (v/v, 4:1)	360	reflux	0	0	33.5