2,2-Dimethylchromens are synthesised by pyridine-catalysed condensation of 3-hydroxyisovaleraldehyde dimethyl acetal (or 3-methylcrotonaldehyde) with appropriate phenols, and, among other examples, the method is applied to lonchocarpin, evodionol 7-methyl ether, jacacreubin, and acronycine.
W. M. Bandaranayake, L. Crombie and D. A. Whiting, J. Chem. Soc. D, 1969, 970 DOI: 10.1039/C29690000970
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