반응 #41895

반응 방정식

EDC

(S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2-oxo-1,2,3,5,7,8-hexahydro-4-oxa-1,6-diaza-anthracene-6,7-dicarboxylic acid 6-tert-butyl ester

→

(3S,7S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2-oxo-1,2,3,5,7,8-hexahydro-4-oxa-1,6-diaza-anthracene-6,7-dicarboxylic acid 6-tert-butyl ester 7-((1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl)ester

용매

DCM

DCM

반응 조건

후처리

1. 1
   세척The organic layer was washed with water and brine
2. 2
   건조dried over sodium sulfate
3. 3
   농축concentrated
4. 4
   기타The residue purified over silica with hexanes-EtOAc gradient (0% EtOAc to 30%)

실험 절차

(S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2-oxo-1,2,3,5,7,8-hexahydro-4-oxa-1,6-diaza-anthracene-6,7-dicarboxylic acid 6-tert-butyl ester (8.0 g, 13.3 mmol) was suspended in 30 mL DCM and 1R-2S-5R (−)-menthol (26.6 mmol), EDC (26.6 mmol) and DMAP (cat.) added. The mixture was stirred at r.t. for 6 h and the mixture diluted with DCM. The organic layer was washed with water and brine, dried over sodium sulfate and concentrated. The residue purified over silica with hexanes-EtOAc gradient (0% EtOAc to 30%) to provide (3S,7S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2-oxo-1,2,3,5,7,8-hexahydro-4-oxa-1,6-diaza-anthracene-6,7-dicarboxylic acid 6-tert-butyl ester 7-((1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl)ester (2.4 g, 1H NMR (400 MHz, CDCl3): 8.2 (m, 1H), 7.5 (m, 1H), 7.42 (d, 1H), 7.35 (m, 2H), 7.25 (m, 1H), 6.9 (m, 2H), 6.7 (m, 1H), 6.6 (s, 1H), 5.55 (m, 1H), 4.8-5.1 (m, 1H), 5.0 (s, 2H), 4.3-4.6 (m, 3H), 3.1 (m, 2H), 1.8 (m, 1H), 1.6 (m, 3H), 1.5 (d, 9H), 1.3 (m, 2H), 0.7-1.0 (m, 9H), 0.4 (m, 3H).

출처