Synthesis of Isoxazoles via Electrophilic Cyclization
摘要:
A variety of 3,5-disubstituted 4-halo(seleno)isoxazoles are readily prepared in good to excellent yields under mild reaction conditions by the reaction of 2-alkyn-1-one O-methyl oximes with ICI, I-2, Br-2, or PhSeBr.
Synthesis of Isoxazoles via Electrophilic Cyclization
作者:Jesse P. Waldo、Richard C. Larock
DOI:10.1021/ol052027z
日期:2005.11.1
A variety of 3,5-disubstituted 4-halo(seleno)isoxazoles are readily prepared in good to excellent yields under mild reaction conditions by the reaction of 2-alkyn-1-one O-methyl oximes with ICI, I-2, Br-2, or PhSeBr.
The Synthesis of Highly Substituted Isoxazoles by Electrophilic Cyclization: An Efficient Synthesis of Valdecoxib
作者:Jesse P. Waldo、Richard C. Larock
DOI:10.1021/jo701942e
日期:2007.12.1
A large number of functionally substituted 2-alkyn-1-one O-methyl oximes have been cyclized under mild reaction conditions in the presence of ICl to give the corresponding 4-iodoisoxazoles in moderate to excellent yields. The resulting 4-iodoisoxazoles undergo various palladium-catalyzed reactions to yield 3,4,5-trisubstituted isoxazoles, including valdecoxib.