Tetrahedron p. 2955 - 2959 (1982)
Update date:2022-09-26
Topics: Synthesis Application One-Pot Experimental dihydropyran
Camps, F.
Colomina, O.
Coll, J.
Messeguer, A.
A novel one-pot preparation of tetrahydrobenzodipyran-4-ones 5 and 6 involving the sequential condensation of resorcinols 7 with 3,3-dimethylacrylic acid (8) and 1,3-dichloro-3-methylbutane (10) in the presence of methanesulphonic acid (which acts as solvent and catalyst) and further conversion of tetrahydrobenzodipyran-4-ones to the corresponding dihydrobenzodipyrans 3 and 4, which are precocene analogues, is described.
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