Trifluoroacetic acid → methyl D-isoglutaminate trifluoroacetic acid salt
反応式
C(OC([NH:8][C@@H:9]([C:16](=[O:18])[NH2:17])[CH2:10][CH2:11][C:12]([O:14][CH3:15])=[O:13])=O)(C)(C)C.[F:19][C:20]([F:25])([F:24])[C:21]([OH:23])=[O:22]>>[F:19][C:20]([F:25])([F:24])[C:21]([OH:23])=[O:22].[NH2:8][C@@H:9]([C:16](=[O:18])[NH2:17])[CH2:10][CH2:11][C:12]([O:14][CH3:15])=[O:13]参加物
実験手順
Methyl t-butyloxycarbonyl-D-isoglutaminate (651 mg, 2.5 mmol) was treated with cold trifluoroacetic acid (5 ml) in a similar manner to that described in Example 33 (IV) to obtain methyl D-isoglutaminate trifluoroacetic acid salt. This salt was then dissolved in ethyl acetate (5 ml), and neutralized by adding TEA (0.35 ml) with cooling. To the resulting solution was added a solution of t-butyloxycarbonyl-O-benzyl-L-serine HONB active ester in ethyl acetate (5 ml), and the reaction was carried out at room temperature for 16 hours. The work-up similar to that described in Example 33 (I) and recrystallization from ethyl acetate/ether gave methyl t-butyloxycarbonyl-O-benzyl-L-seryl-D-isoglutaminate (0.78 g). m.p. 103°-104° C. [α]D22 +7.0 (C 0.5, ethanol). Rf5 =0.40.
出典と根拠
- ORDレコード
- ord-e95bdc292cfe4f3a8f09458681b03120
- 出典データセット
- uspto-grants-1983_01
- 特許番号
- US04369178
反応ノート
読み込み中…