(2S,4R)-N-t-Butoxycarbonyl-4-methyl glutamic acid → 2S,4R-4-Methylglutamate
반응식
C(OC([NH:8][C@H:9]([C:16]([OH:18])=[O:17])[CH2:10][C@@H:11]([CH3:15])[C:12]([OH:14])=[O:13])=O)(C)(C)C>FC(F)(F)C(O)=O.C(Cl)Cl>[CH3:15][C@@H:11]([C:12]([OH:14])=[O:13])[CH2:10][C@@H:9]([C:16]([OH:18])=[O:17])[NH2:8]참가 물질
3
실험 절차
The Boc-protected diacid, (2S, 4R)-N-t-butoxycarbonyl- 4-methyl glutamic acid, was subjected to a mixture of trifluoroacetic acid:methylene chloride (40:60, 100 mL) for 3 hr at room temperature. The volatiles were removed in vacuo and the residue was azeotroped with toluene (50 mL). Water (150 mL) was added and the aqueous phase extracted with a 5% solution of trioctylamine in chloroform (3 x 200 mL). The combined organic phases were washed with water (50 mL) and the combined aqueous phases evaporated by being placed on a lyophilizer for 48 hr to give the product (4.6 g, 66% in two steps) as a white foam which was recrystallized in acetone and water. mp=169°-170° C., 1H NMR (200 MHz, D2O): δ 3.80 (dd, J=7.3, 7.3 Hz, 1H), 2.55 (m, 1H), 2.15 (ddd, J=14.7, 8.7, 6.6 Hz, 1H), 1.75 (ddd, J=14.6, 7.4, 5.4 Hz, 1H), 1.05 (d, J=7.0 Hz, 3H). Anal. Calculated for C6H11NO4 : C, 44.71; H, 6.88; N, 8.69. Found: C, 44.59; H, 6.85; N, 8.61.