Abstract
The hydrogenation at Raney nickel of the pyrazoline ring in methyl exo-3,4-diazatricyclo-[5.2.1.02,6]dec-4-ene-5-carboxylate takes place quantitatively with the preferential formation of the trans isomer of 5-amino-exo-3-azatricyclo[5.2.1.02,6]decan-4-one. The 3-methoxycarbonylmethyl-, 3-acetyl-, and 3-nitroso-substituted esters are not hydrogenated under these conditions.
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