Reaction of 4-chlorocoumarin with organometallic reagents. Synthesis of trialkylbenzopyrans, 4-chlorobenzopyrans, 4-alkylcoumarins and o-hydroxyphenylprop-2-ynyl alcohols
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 22,p. 3075-3080
- https://doi.org/10.1039/p19920003075
Abstract
4-Chlorocoumarin has been shown to be a highly versatile starting material when treated with organometallic reagents. Thus, it has allowed the selective synthesis either directly, or through simple additional transformations, of 4-alkylcoumarins (with R2CuLi in Et2O, or PriMgBr in THF), 2-chloro-2-(o-hydroxyphenyl)allyl alcohols or their 4-chloro-2H-1-benzopyran derivatives (with RMgX in THF), 2-(o-hydroxyphenyl)prop-2-ynyl alcohols (when non-acid hydrolysis were used in the latter reactions) and 2,2,4-trialkyl-2H-1-benzopyrans (when excess of RMgX or R3Al reagents were used).Keywords
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