Regiochemistry Discoveries in the Use of Isoxazole as a Handle for the Rapid Construction of an All-Carbon Macrocyclic Precursor in the Synthetic Studies of Celastrol
作者:Thomas M. Kaiser、Jinhua Huang、Jiong Yang
DOI:10.1021/jo400612v
日期:2013.6.21
convergent synthetic route to an all-carbon, 14-membered Z,E-macrocyclic bis-enone during our syntheticstudy of celastrol. The 1,3-dipolar cycloaddition of nitrile oxide and alkyne was employed for fragment coupling and introducing the 1,3-diketone moiety masked in the form of an isoxazole. We discovered that cycloaddition of the nitrile oxide and the enyne gave the rare 3,4-disubstituted isoxazole adduct