| 摘要 |
PCT No. PCT/FR95/01241 Sec. 371 Date Mar. 28, 1997 Sec. 102(e) Date Mar. 28, 1997 PCT Filed Sep. 27, 1995 PCT Pub. No. WO96/10010 PCT Pub. Date Apr. 4, 1996A method for preparing a compound of formula (I), wherein R1 and R2, which are the same or different, are a hydrogen atom or an alkyl or alkoxy radical, or R1 and R2, taken together with the carbon atom to which they are attached, form a cycloalkyl radical containing 3-6 carbon atoms. The method comprises dehalogenating a derivative of formula (lI), wherein R1 and R2 have the same meanings as in formula (1) and Hal is a chlorine or bromine atom, using 1-2 mol of triethylammonium formate, in the presence of 0.002-0.1 mol of coal-borne palladium per mol of the compound of formula (II), in aceonitrile or tetrahydrofuran and at a temperature between 50 DEG C. and the boiling point of the reaction medium. <IMAGE> (I) <IMAGE> (II)
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