Diastereoselective Synthesis of Hydantoin- and Isoxazoline-Substituted Dispirocyclobutanoids
作者:Kyung-Ho Park、Mark J. Kurth
DOI:10.1021/jo000152c
日期:2000.6.1
Synthetic strategies for constructing novel achiral cyclobutanoid isoxazolidinoimidazolidinedione heterocycles, with a generalized structure of II, have been developed via 1,3-dipolar cycloaddition and carbanilide cyclization transformations from methylenecyclobutane 13. The exo methylene cyclobutane system has made the realization of some diasteroselectivity possible, such that the H-bond (Boc-NH) directed product (i.e., 14) was obtained with 3:1 selectivity relative to the non-H-bond directed product (i.e., 15).