| abstract |
The present invention relates to novel compounds of formula(1). n n n wherein: R 1 is hydrogen atom or lower alkyl group, X is bromine atom or chlorine atom; and which are usefull for the preparation of the cycloheptanoides such as cycloheptimidazole derivatives. The compound having formula (1) is obtained in a single pot by the reaction of a trialkylsilylether compound with a dihalocarbene which, in turn, is prepared from the reaction of chloroform or bromoform in the presence of base. |