Journal
FITOTERAPIA
Volume 164, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.fitote.2022.105353
Keywords
Forskolin analogues; Cross -coupling reaction; Arylation reaction
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A ring distortion strategy was used to synthesize a series of intramolecular cross-coupled analogues of forskolin. The target compounds were obtained through several reaction steps with high yields.
A ring distortion strategy was applied to the synthesis of a series of intramolecular cross-coupled analogues of forskolin 1. Treatment with palladium acetate, forskolin underwent an intramolecular cross-coupling reaction to generate a novel cycloalkene ether 2 in 85% yield. Under the same conditions, a series of forskolin ester ana-logues 4a -4d were prepared from 1-OH ester derivatives of forskolin 3a -3d in 85-93% yields. Treating cyclo-alkene ether 2 with aryl iodides in the presence of a palladium catalyst afforded Z-isomers arylation products 5a -5e in a stereoselective manner in 70-85% yields.
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