Effect of Ring Size on the<i>Exo</i>/<i>Endo</i>Selectivity of a Thermal Double Cycloaddition of Fused Pyran-2-ones
作者:Kris̆tof Kranjc、Franc Perdih、Marijan Koc̆evar
DOI:10.1021/jo9011199
日期:2009.8.21
A study of an unusual effect of the size of the ring fused to 2H-pyran-2-ones on the exo/endo selectivity of a thermal double cycloaddition of N-substituted maleimides or maleic anhydride yielding bicyclo[2.2.2]octene derivatives is presented. With subtle variations of starting compounds and reaction conditions exclusively exo,exo or exo,endo products can be prepared.