Development of New Multicomponent Reactions in Eco-Friendly Media-Greener Reaction and Expeditious Synthesis of Novel Bioactive Benzylpyranocoumarins

Table 2

Chemical yields and physical properties of coumarins derivatives 5a–5g.

Entry	R	Compound^b	Yield^a (%)	Melting point (°C)
1	H	5a	60	204
2	p-CH3	5b	70	221
3	p-N(CH3)2	5c	75	176
4	p-NO2	5d	80	138
5	m-Br	5e	75	242
6	m-OCH3	5f	85	138
7	m-OH	5g	90	174

^aAll reactions were carried with hydrazine (0.005 mol), ethyl acetoacetate (0.005 mol), benzaldehyde (0.005 mol), and 4-hydroxycoumarin (0.005 mol). ^bYield of the isolated product. [BMIM][CF₃SO₃], 1-butyl-3-methylimidazolium trifluoromethanesulfonate.