A New Synthetic Route to 12-Oxo-1, 15-pentadecanlactam

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12-Oxo-1, 15-pentadecanlactam 7 was synthesized from cyclododecanone with a total yield of 36% in a seven-step reaction. The azide 5 to 12-nitro-1, 15-pentadecanlactam 6 is the key step featured by direct ring expansion.
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