Steric factors in the cyclization of 4-azaheptane-2,6-diones to dehydropiperid-3-ones and the stereochemistry of reduction of 2,2-dimethyl- and 5-neopentylpiperid-3-ones
Steric factors in the cyclization of 4-azaheptane-2,6-diones to dehydropiperid-3-ones and the stereochemistry of reduction of 2,2-dimethyl- and 5-neopentylpiperid-3-ones