FeCl3-Catalyzed Nucleophilic Substitution of Propargylic Acetates with Enoxysilanes
摘要:
[Graphics]An efficient FeCl3-catalyzed substitution reaction of propargylic acetates with enoxysilanes under mild conditions to afford corresponding gamma-alkynyl ketones has been developed. The substitution reaction is followed by a TsOH-catalyzed cyclization without purification of the gamma-alkynyl ketone intermediates, offering a straightforward synthetic route to tri- or tetrasubstituted furans.
Boron Trifluoride Etherate Mediated 1,4-Addition of (1-Alkynyl)diisopropoxyboranes to α,β-Unsaturated Ketones. A Convenient New Route to 3-Alkynyl Ketone Synthesis
In the presence of BF3 etherate, (1-alkynyl)diisopropoxyboranes react with α,β-unsaturatedketones to give 1,4-addition products selectively in good yields.