反応 #1982980

反応方程式

1-Hydroxybenzotriazole

(E)-(2R,3R,4S,5S)-3,5-dimethoxy-2,4-dimethyl-nona-6,8-dienoic acid

Trimethylsilyltrifluoromethanesulfonate

(S)-1-{(S)-2-[(S)-2-tert-butoxycarbonylamino-3-(4-methoxy-phenyl)-propionylamino]-3-[3-(tert-butyl-dimethyl-silanyloxy)-phenyl]-propionyl}-hexahydro-pyridazine-3-carboxylic acid but-3-enyl ester

N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride

N,N-diisopropylethylamine

→

title compound

収率 64.0%

(S)-1-{(S)-3-[3-(tert-Butyl-dimethyl-silanyloxy)-phenyl]-2-[(S)-2-((Z)-(2R,3R,4S,5S)-3,5-dimethoxy-2,4-dimethyl-nona-6,8-dienoylamino)-3-(4-methoxy-phenyl)-propionylamino]-propionyl}-hexahydro-pyridazine-3-carboxylic Acid but-3-enyl Ester

収率 64.0%

溶媒

acetonitrile

dichloromethane

反応条件

後処理

1. 1
   その他The volatiles were evaporated
2. 2
   その他to afford a colourless foam which
3. 3
   workup.STIRRINGthe reaction was stirred at room temperature for 18 h
4. 4
   その他The solvent was evaporated
5. 5
   洗浄This was washed with saturated ammonium chloride, saturated sodium bicarbonate
6. 6
   乾燥dried over anhydrous sodium sulfate
7. 7
   その他the solvent evaporated
8. 8
   その他The residue was purified
9. 9
   洗浄by eluting through a plug of silica gel (eluting with ethyl acetate)

実験手順

Trimethylsilyltrifluoromethanesulfonate (193 μL, 1.07 mmol) was added dropwise to a solution of (S)-1-{(S)-2-[(S)-2-tert-butoxycarbonylamino-3-(4-methoxy-phenyl)-propionylamino]-3-[3-(tert-butyl-dimethyl-silanyloxy)-phenyl]-propionyl}-hexahydro-pyridazine-3-carboxylic acid but-3-enyl ester (438 mg, 0.59 mmol) in dichloromethane (10 mL) at 0° C. under nitrogen and the reaction was stirred for 60 minutes. To this was added N,N-diisopropylethylamine (412 μL, 2.37 mmol) and the reaction was warmed to room temperature. The volatiles were evaporated to afford a colourless foam which dissolved in acetonitrile (10 mL). 1-Hydroxybenzotriazole (100 mg, 0.59 mmol) was added, followed by N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (136 mg, 0.71 mmol) and (E)-(2R,3R,4S,5S)-3,5-dimethoxy-2,4-dimethyl-nona-6,8-dienoic acid (144 mg, 0.59 mmol) and the reaction was stirred at room temperature for 18 h. The solvent was evaporated and the residue was suspended in ethyl acetate. This was washed with saturated ammonium chloride, saturated sodium bicarbonate, dried over anhydrous sodium sulfate and the solvent evaporated. The residue was purified by eluting through a plug of silica gel (eluting with ethyl acetate) to afford the title compound as a yellow oil (326 mg, 64%). 1H NMR (300 MHz, CDCl3) δ0.18 (s, 6H), 0.75 (d, J=6.9 Hz, 2H), 0.98 (s, 9H), 1.02 (d, J=6.9 Hz, 2H), 1.36-1.50 (m, 3H), 1.65-1.86 (m, 3H), 2.27-2.36 (m, 1H), 2.42 (app q, J=6.7 Hz, 2H), 2.60-3.00 (m, 4H), 3.13 (dd, J=6.2, 13.4 Hz, 1H), 3.25 (s, 3H), 3.33 (s, 3H), 3.37-3.52 (m, 2H), 3.80 (s, 3H), 3.78-3.85 (m, 1H), 4.11-4.23 (m, 2H), 4.27-4.37 (m, 1H), 4.63 (app q, J=6.0 Hz, 1H), 5.09-5.30 (m, 4H), 5.46 (dd, J=8.7, 15.4 Hz, 1H), 5.54-5.64 (m, 1H), 5.71-5.86 (m, 1H), 6.17-6.48 (m, 4H), 6.60-6.64 (m, 1H), 6.68 (dd, J=1.6, 8.2 Hz, 1H), 6.74 (d, J=7.6 Hz, 1H), 6.83 (d, J=8.5 Hz, 2H), 7.10 (t, J=7.8 Hz, 1H), 7.18 (d, J=8.5 Hz, 1H).

出典