反应详情

The reaction is carried out under the same conditions as in Example 3 and with the same proportions of reactants. After chromatography on a silica column, the product can be recrystallized from ethyl acetate to give the title derivative in the form of white crystals melting at 122° C. (capillary). Thin layer chromatography under the conditions already described shows a single spot whose Rf of 0.2 is identical to that of the product of Example 3. The IR spectrum run in KBr has the same principal characteristic bands as in Example 3, although the fine bands between 1000 and 600 cm-1 are markedly different.