Organic Chemistry International

Research Article

Green Chemistry: New Synthesis of Substituted Chromenes and Benzochromenes via Three-Component Reaction Utilizing Rochelle Salt as Novel Green Catalyst

Table 1

Yields and melting points of the synthesized compounds 6–8.
CompoundRYield %Observed m.p.Reported m.p.References
6a2,3-Dimethoxy85 250——
6b2,5-Dimethoxy85 170——
6c3-Benzyloxyphenyl86 230——
6d4-MeO86 112–114111-112[30, 32]
6e4-Cl90 184164[30]
6fH80 228231[32]
6g3,4,5-Trimethoxy85 210205[34]
6h3-NO284 170169-170[32]
7a2,3-Dimethoxy85260——
7b2,5-Dimethoxy75240——
7c3,4,5-Trimethoxy80190189[35]
7d4-Cl90235232[20]
7e3-NO282210212[20]
7fH90205205[20]
7g4-MeO84204205[35]
8a2,3-Dimethoxy80240——
8b2,4-Dimethoxy80205——
8c2,5-Dimethoxy75206——
8d3,4,5-Trimethoxy85209——
8e3-NO281195190[29]
8f 4-MeO92260255[26]
8gH90280278–280[20]
8h4-Cl83187191[29]