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2-Oxo-3R,4S,5S,6S-tetraethoxyazepane was conveniently synthesized from D-glucono-1,5-lactone with a yield of 10% overall.The key step of synthetic route-reductive 1,6-cyclization was completed efficiently by using Ph3P to give the expected lactam.(c)2008 Zhi Jie Fang.Published by Elsevier B.V.on behalf of Chinese Chemical Society.All rights reserved.