A method of manufacturing an amorphous form of the hemi-calcium salt of (3R, 5R) 7-[3-phenyl-4-phenylcarbamoyl-2-(4-fluorophenyl)-5-isopropyl-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid of formula (I), in which (3R, 5R) 7-[3-phenyl-4-phenylcarbamoyl-2-(4-fluorophenyl)-5-isopropyl-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid or its salt with a cation M+ wherein M30 is either a cation of an alkali metal or an ammonium cation of formula RnN(+)H(4−n) wherein R is lower C1–C5 alkyl, n may reach values ranging between 0 and 3, is, without isolating the intermediate in the form of the hemi-calcium salt or of another salt, acid or lactone, converted, in a solution, by the treatment with the calcium salt or calcium hydroxide, or a calcium C1–C5 alcoholate, to the hemi-calcium salt, and the latter is precipitated with a C1–C5hydrocarbon or dialkylether of formula R1OR2, wherein each of R1 and R2 is a C1–C5 alkyl group. The starting acid or its salt is prepared starting from (3R, 5R) tert-butyl (6-2-[3-phenyl-4-phenylcarbamoyl-2-(4-fluorophenyl)-5-isopropyl-pyrrol-1-yl]-ethyl}-2,2-dimethyl-[1,3]dioxane-4-yl) acetate of formula II.
一种制备(3R, 5R) 7-[3-苯基-4-苯基
氨基甲酰基-2-(4-
氟苯基)-5-异丙基
吡咯-1-基]-3,5-二羟基
庚酸半
钙盐的非晶态形式的方法,其中(3R, 5R) 7-[3-苯基-4-苯基
氨基甲酰基-2-(4-
氟苯基)-5-异丙基
吡咯-1-基]-3,5-二羟基
庚酸或其与阳离子M+的盐,其中M+是碱
金属的阳离子或公式RnN(+)H(4−n)的
铵阳离子,其中R是较低的C1-C5烷基,n的值可以在0和3之间,通过在溶液中用
钙盐或
钙氢氧化物或
钙C1-C5醇盐处理而不隔离半
钙盐或其他盐,酸或内酯的中间体,将其转化为半
钙盐,并用公式R1OR2的C1-C5烃或二烷基醚沉淀后得到该半
钙盐。起始酸或其盐是从公式II的(3R, 5R)叔丁基(6-2-[3-苯基-4-苯基
氨基甲酰基-2-(4-
氟苯基)-5-异丙基
吡咯-1-基]-乙基}-2,2-二甲基-[1,3]
二噁烷-4-基)
醋酸酯开始制备的。