Ethyl chloroformate → 2-Benzyl-5-carbethoxy-2,5-diazabicyclo[2.2.1]heptane

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Using the procedure for preparation of 2-benzyl-5-(N,N-diethylcarbamyl)-2,5-diazabicyclo[2.2.1]heptane hydrochloride as related in Example 11, 29.0 g of 2-benzyl-2,5-diazabicyclo[2.2.1]heptane dihydroiodide, prepared according to the procedure given in Example 11, was treated with 1.5 equivalents of ethyl chloroformate to yield crude product. Dry column chromatography, a technique described by B. Loev and M. M. Goodman in Chem. Ind. (London), p 2026, 1967, on 1700 g alumina using chloroform development provided 11.6 g (68%) of pure product, characterized as the maleate salt, melting point 124°-128° C.

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