Enolethers, XVIII. - A Simple Synthesis of Coumarins
In boiling 1,2-dichloroethane 3-ethoxyacryloyl chloride (1) reacts with phenols 2 to yield 3-ethoxyacrylates 3, which by treatment with conc. sulfuric acid/10percent SO3 cyclize to give coumarins 9 in good yields.The methoxy-substituted compounds 3d and 3k do not react to coumarins 9 with H2SO4/SO3 but with POCl3/H2O at room temperature.
Ziegler, Thomas,Moehler, Hans,Effenberger, Franz
p. 373 - 378
(2007/10/02)
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