Iodocyclization of Ethoxyethyl Ethers to Ynamides: An Immediate Construction to Benzo[b]furans
摘要:
The iodocyclization of ethoxyethyl ethers to ynamides was completed within three seconds. The corresponding benzo[b]furans were obtained in high yields (84%-quant.) under mild conditions.
Iodocyclization of Ethoxyethyl Ethers to Alkynes: A Broadly Applicable Synthesis of 3-Iodobenzo[b]furans
摘要:
A wide variety of 3-iodobenzo[b]furans were readily prepared by iodocyclization of 2-alkynyl-1-(1-ethoxyethoxy) benzenes with the I(Coll)(2)PF6-BF3 center dot OEt2 combination. Aryl-, vinylic-, and alkyl-substituted alkynes undergo iodocyclization in good to excellent yields. The mechanism of the reaction is also discussed.