STEREOSELECTIVITY IN CYCLOADDITION OF PHENYLGLYOXYLNITRILE OXIDE TO 7-SUBSTITUTED NORBORNADIENES AND 8-SUBSTITUTED 2-AZABICYCLOOCT-3,6-DIENES
The cycloaddition of phenylglyoxylonitrile oxide to the 7-substituted norbornadienes 1a-c gives predominantly the endo isomers, but that to the 8-substituted 2-azabicyclooct-3,6-dienes 2a-b the exo isomers.