Microwave-Assisted Synthesis of Isopropyl β-(3,4-Dihydroxyphenyl)-α-hydroxypropanoate

Table 1

Experimental factors and levels.

Reaction	Level	Factor A; temperature (°C)	Factor B; time (min)	Factor C; MW power (W)
Azolactone synthesis	1	128	12	500
	2	138	15	600
	3	148	18	700
Acrylic acid synthesis	1	65	8	300
	2	70	10	400
	3	75	12	500
𝛽-(3,4-Dihydroxyphenyl) pyruvic acid synthesis	1	90	15	900
	2	95	20	900
	3	100	30	900
Isopropyl 𝛽-(3,4-dihydroxyphenyl)-𝛼-hydroxypropanoate synthesis	1	80	10	100
	2	85	20	300
	3	90	25	500