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Beilstein J. Org. Chem. 2016, 12, 16–21, doi:10.3762/bjoc.12.3
Graphical Abstract
Figure 1: 4H-chromene (1) and some of its biologically active derivatives.
Scheme 1: a) Preparation of 2-bromoallyl sulfones 2a,b; b) reaction of 2a with 4-chlorophenol and Cs2CO3; c) ...
Scheme 2: Base-mediated cyclization reaction of o-hydroxychalcone 7a and 2-bromoallyl sulfone 2a.
Scheme 3: Preparation of ortho-hydroxychalcones 7a–i.
Scheme 4: Synthesis of 4H-chromenes via base-mediated reactions of 7a–i and 2a,b. Reaction conditions: 7a–i (...
Scheme 5: A plausible mechanistic rationalization for the formation of 4H-chromene derivative 8aa from 7a and ...