Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 71, Issue 22, Pages 8665-8668Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo0614588
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An indium-mediated Barbier-type reaction of difluoropropargyl bromide with several aldehydes in aqueous media was enhanced by a catalytic amount of a lanthanide triflate (5 mol %). The reaction gave the corresponding beta,beta-difluorohomopropargyl alcohols with high regioselectivity. The [2 + 2 + 2] alkyne cyclotrimerization of beta,beta-difluorohomopropargyl alcohols with monosubstituted acetylenes produced 4,4-difluoroisochromans in good yields with moderate regioselectivity.
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