Preparation of Optically Active Succinic Acid Derivatives. II. Efficient and Practical Synthesis of KAD-1229.
作者:Toshiaki YAMAGUCHI、Takashi YANAGI、Hiroshi HOKARI、Yuko MUKAIYAMA、Tetsuhide KAMIJO、Iwao YAMAMOTO
DOI:10.1248/cpb.46.337
日期:——
For large-scale synthesis of monocalcium bis[(2S)-2-benzyl-3-(cis-hexahydroisoindolin-2-ylcarbonyl)propionate]dihydrate (1, KAD-1229), we investigated regioselective reactions of (S)-2-benzylsuccinic acid (2) with cis-hexahydroisoindoline (4). It was difficult to obtain a half amide regioselectively through coupling reaction of the (S)-acid 2 with the amine 4. Therefore, the succinic acid 2 was converted to bis-activated esters 3a-c and these were reacted with 4 to give the amides 5a-c in good yields, regioselectively. The amides 5a-c were derived to KAD-1229, which has a potent hypoglycemic effect, in good yields.
为了大规模合成双[(2S)-2-苄基-3-(顺式六氢异吲哚啉-2-羰基)丙酸]二水单钙(1,KAD-1229),我们研究了(S)-2-苄基丁二酸(2)与顺式六氢异吲哚啉(4)的区域选择性反应。通过(S)-酸 2 与胺 4 的偶联反应很难获得半酰胺的区域选择性。因此,将琥珀酸 2 转化为双活化酯 3a-c,然后与 4 反应,得到酰胺 5a-c,收率很高,且具有区域选择性。酰胺 5a-c 以良好的产率衍生出具有强效降血糖作用的 KAD-1229。