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DOI: 10.1055/sos-SD-014-00294

Williams, A. C.; Camp, N.Science of Synthesis, (200314371.

These reactions represent a very mild, general method for the preparation of functionalized 3-acyl-2H-1-benzopyran-2-ones 6671. The mildness of the conditions, generally 70°C in diethyl ether, means that a wide range of substituents is tolerated (Scheme 22).[‌49‌,‌54‌,‌166‌‌168‌]

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