تفاعل #558124

معادلة التفاعل

methyl 2-(6-benzyl-2-methyl-4-(p-tolyl)-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)-2-(tert-butoxy)acetate

intermediate 16

methyl 2-(6-benzyl-2-methyl-4-(p-tolyl)-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)-2-(tert-butoxy)acetate

NaOH

→

2-(6-benzyl-2-methyl-4-(p-tolyl)-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)-2-(tert-butoxy)acetic acid

المردود 65.0%

المذيبات

dioxane

ظروف التفاعل

المعالجة

1. 1
   أخرىThe mixture was quenched with 1 ml 1N HCl
2. 2
   تركيزconcentrated
3. 3
   أخرىThe crude material was purified via preparative LC/MS with the following conditions
4. 4
   workup.WAITGradient: 60-100% B over 30 minutes
5. 5
   أخرىa 5-minute hold
6. 6
   workup.ADDITIONFractions containing the desired product
7. 7
   أخرىdried via centrifugal evaporation

الإجراء التجريبي

To a solution of methyl 2-(6-benzyl-2-methyl-4-(p-tolyl)-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)-2-(tert-butoxy)acetate (intermediate 16) (47.3 mg, 100 mmol) in dioxane (3 ml) was added 1N NaOH (1.0 mL) and the mixture was stirred at 70° C. for 1 h. The mixture was quenched with 1 ml 1N HCl and concentrated. The crude material was purified via preparative LC/MS with the following conditions: Column: Waters XBridge C18, 19×150 mm, 5-μm particles; Guard Column: Waters XBridge C18, 19×10 mm, 5-μm particles; Mobile Phase A: water with 20-mM ammonium acetate; Mobile Phase B: 95:5 methanol:water with 20-mM ammonium acetate; Gradient: 60-100% B over 30 minutes, then a 5-minute hold at 100% B; Flow: 20 mL/min. Fractions containing the desired product were combined and dried via centrifugal evaporation to provide 2-(6-benzyl-2-methyl-4-(p-tolyl)-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)-2-(tert-butoxy)acetic acid (29.9 mg, 65% yield). 1H NMR (500 MHz, DMSO-d6) δ ppm 7.20-7.35 (m, 7H), 7.17 (d, J=7.63 Hz, 1H), 7.09 (dd, J=1.53, 7.63 Hz, 1H), 4.77 (s, 1H), 3.44-3.58 (m, 2H), 3.30 (br. s., 1H), 2.99 (d, J=15.56 Hz, 1H), 2.81-2.89 (m, 2H), 2.75 (td, J=5.49, 10.99 Hz, 1H), 2.56-2.65 (m, 1H), 2.48 (s, 3H), 2.37 (s, 3H), 0.87 (s, 9H). LCMS (M+H) calcd for C29H35N2O3: 459.26. found: 459.3.

المصدر