Reaktion #161944

Reaktionsgleichung

#87

N-(tert-butoxycarbonyl)-N,2-dimethylalanyl-N-[(3R,4S,5S)-3-methoxy-1-{(2S)-2-[(1R,2R)-1-methoxy-2-methyl-3-oxo-3-{[(1S)-2-phenyl-1-(1,3-thiazol-2-yl)ethyl]amino}propyl]pyrrolidin-1-yl}-5-methyl-1-oxoheptan-4-yl]-N-methyl-L-valinamide

trifluoroacetic acid

→

N,2-dimethylalanyl-N-[(3R,4S,5S)-3-methoxy-1-{(2S)-2-[(1R,2R)-1-methoxy-2-methyl-3-oxo-3-{[(1S)-2-phenyl-1-(1,3-thiazol-2-yl)ethyl]amino}propyl]pyrrolidin-1-yl}-5-methyl-1-oxoheptan-4-yl]-N-methyl-L-valinamide

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Einengenthe reaction mixture was concentrated in vacuo
2. 2
   Waschenwashed with saturated aqueous sodium bicarbonate solution
3. 3
   Trocknendried over sodium sulfate
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated in vacuo
6. 6
   Sonstigeto give #88 (52 mg, quantitative)
7. 7
   workup.ADDITIONa mixture of rotamers, characteristic signals

Vorschrift

To a mixture of #87 (58 mg, 0.068 mmol, 1 eq.) in dichloromethane (8 mL) was added trifluoroacetic acid (2 mL). After stirring overnight, the reaction mixture was concentrated in vacuo. The residue was taken up in ethyl acetate (10 mL), washed with saturated aqueous sodium bicarbonate solution, dried over sodium sulfate, filtered, and concentrated in vacuo to give #88 (52 mg, quantitative). LC-MS 757.6 [M+H+], retention time=0.69 minute; 1H NMR (400 MHz, DMSO-d6), presumed to be a mixture of rotamers, characteristic signals: δ [8.64 (br d, J=8.6 Hz) and 8.87 (br d, J=8.6 Hz), total 1H], 7.80-7.85 (m, 1H), [7.77 (d, J=3.3 Hz) and 7.80 (d, J=3.1 Hz), total 1H], [7.63 (d, J=3.1 Hz) and 7.66 (d, J=3.3 Hz), total 1H], 7.20-7.31 (m, 4H), 7.13-7.19 (m, 1H), [5.39 (ddd, J=11, 8.5, 4 Hz) and 5.49-5.56 (m), total 1H], [4.51 (dd, J=9, 8 Hz) and 4.61 (dd, J=9, 8 Hz), total 1H], 3.16, 3.20, 3.21 and 3.25 (4 s, total 6H), 2.94 and 3.03 (2 br s, total 3H), 2.10 and 2.10 (2 s, total 3H), 1.16 (br s, 3H), 1.04-1.12 (m, 6H), 0.72-0.80 (m, 3H).

Quelle