[EN] PROCESS FOR THE PREPARATION OF 1,3-DIOXOLO [4,5-C] PIPERIDIN-7-OLS AND RELATED COMPOUNDS<br/>[FR] PROCEDE DE PREPARATION DE 1,3-DIOXOLO [4,5-C] PIPERIDIN-7-OLS ET COMPOSES CONNEXES
申请人:DELMAR CHEMICALS INC
公开号:WO2005066181A1
公开(公告)日:2005-07-21
A process is disclosed for preparation of piperidine derivatives, preferably 1,3-dioxolo 4,5-c piperidin-7-ols such as (3aS, 4R, 7S, 7aR)-2,2,4-trimethyl-1,3-dioxolo 4,5-c piperidin-7-ol and its polyhydroxylated derivatives. In a preferred process, 2,3-O-isopropylidene-1,4-lactone (A) is reacted with methanesulfonyl chloride to form (3aR, 4S, 6aR) methanesulfonic acid 2,2-dimethyl-6-oxo-tetrahydro-furo 3,4-d 1,3 dioxol-4-ylmethyl (B). Compound (B) is then reacted with methylmagnesium halide to form (3aR, 4S, 6aR)-methanesulfonic acid 6-hydroxy-2,2,6-trimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylmethyl ester (C), which is reacted with phthalimide to form (3aR, 4S, 6aR)-2-(6-hydroxy-2,2,6-trimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylmethyl)-isoindole-1,3-dione (D). Compound (D) is reacted with hydrazine to form (3S, 7S, 7aR)-2,2,4-trimethyl-3a,6,7,7a-tetrahydro- 1,3 dioxolo 4,5-c pyridin-7-ol (E), which is hydrogenated to give the corresponding 1,3-dioxolo 4,5-c piperidin-7-ol (F). The synthesis has an overall yield which is typically greater than 50% and avoids the use of reagents such as triflic anhydride and sodium azide.
揭示了一种制备哌啶衍生物的过程,最好是1,3-二氧杂环[4,5-c]哌啶-7-醇,如(3aS, 4R, 7S, 7aR)-2,2,4-三甲基-1,3-二氧杂环[4,5-c]哌啶-7-醇及其多羟基衍生物。在一种首选的过程中,2,3-O-异丙基亚甲酰基-1,4-内酯(A)与甲磺酰氯反应,形成(3aR, 4S, 6aR) 甲磺酸 2,2-二甲基-6-氧代-四氢呋喃[3,4-d][1,3]二噁烷-4-基甲酯(B)。然后,化合物(B)与甲基镁卤化物反应,形成(3aR, 4S, 6aR)-甲磺酸 6-羟基-2,2,6-三甲基-四氢呋喃[3,4-d][1,3]二噁烷-4-基甲酯(C),再与邻苯二甲酰亚胺反应,形成(3aR, 4S, 6aR)-2-(6-羟基-2,2,6-三甲基-四氢呋喃[3,4-d][1,3]二噁烷-4-基甲基)-异吲哚-1,3-二酮(D)。化合物(D)与肼反应,形成(3S, 7S, 7aR)-2,2,4-三甲基-3a,6,7,7a-四氢-1,3-二氧杂环[4,5-c]吡啶-7-醇(E),经过氢化得到相应的1,3-二氧杂环[4,5-c]哌啶-7-醇(F)。该合成的总产率通常大于50%,并避免使用三氟乙酰酐和偏硝基苯胺等试剂。