A method for the synthesis of a compound of formula (I) as a mixture of enantiomers, formula (I) (wherein R1 is H or an acid protective group and H+A- indicates an optional acid with which the compound of formula (I) may form an ammonium salt) said method comprising; A) reacting a cyclohexyl aziridine with a dialkyl malonate, whereby to provide a trans-fused 3-alkylcarbonyl-octahydro-indol-2-one; B) decarbonylation at the 3-position, conversion of the ketone of the resulting trans-octahydro-indol-2-one to an optionally protected carboxylic acid group; and C) optionally removing any N-substitution if necessary.
一种合成式(I)化合物的方法,该化合物为对映体的混合物,式(I)如下(其中R1为H或酸保护基,H+A-表示化合物(I)可能形成
铵盐的可选酸)该方法包括:A)将环己基环氧
丙烷与二烷基
丙二酸酯反应,从而提供顺式螺环3-烷基羰基-八氢
吲哚-2-酮;B)在3位脱羰基,将所得的顺式八氢
吲哚-2-酮的酮基转化为可选的保护
羧酸基;以及C)如有必要,可选择性地去除任何N取代基。