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Diisopropylethylamine → 3-[2(R)-Triethylsiloxypropyl]amino-3-methyl-N-[2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-3(R)-yl]-butanamide

HRID 1033443
Notes
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Reaction equation

HRID 1033443 reaction equation
[OH:1][C@H:2]([CH3:24])[CH2:3][NH:4][C:5]([CH3:23])([CH3:22])[CH2:6][C:7]([NH:9][C@@H:10]1[CH2:16][CH2:15][C:14]2[CH:17]=[CH:18][CH:19]=[CH:20][C:13]=2[NH:12][C:11]1=[O:21])=[O:8].C(N(CC)C(C)C)(C)C.FC(F)(F)S(O[Si:40]([CH2:45][CH3:46])([CH2:43][CH3:44])[CH2:41][CH3:42])(=O)=O>C(Cl)Cl>[CH2:41]([Si:40]([CH2:45][CH3:46])([CH2:43][CH3:44])[O:1][C@H:2]([CH3:24])[CH2:3][NH:4][C:5]([CH3:23])([CH3:22])[CH2:6][C:7]([NH:9][C@@H:10]1[CH2:16][CH2:15][C:14]2[CH:17]=[CH:18][CH:19]=[CH:20][C:13]=2[NH:12][C:11]1=[O:21])=[O:8])[CH3:42]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 2733308Triethylsilyl trifluoromethanesulphonateHCID 186514293-[2(R)-Hydroxypropyl]amino-3-methyl-N-[2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-3(R)-yl]-butanamide

Product 1

HCID 186514313-[2(R)-Triethylsiloxypropyl]amino-3-methyl-N-[2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-3(R)-yl]-butanamideYield 72.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of 660 mg (1.48 mmol) of the intermediate obtained in Step B in 3 mL of methylene chloride at room temperature was added 1.1 mL of N,N-diisopropylethylamine (0.81 g, 4.2 eq.) followed by 0.71 mL of triethylsilyl trifluoromethanesulfonate (0.83 g, 2.1 eq.). The resulting mixture was stirred at room temperature for 2 hours then partitioned between ethyl acetate and saturated aqueous sodium chloride (buffered to pH 9 with 2 drops of ammonium hydroxide). The organic layer was separated, washed with buffered brine, dried over magnesium sulfate, filtered and solvents evaporated under vacuum. The residue was purified by preparative high pressure liquid chromatography on silica, eluting with ethyl acetate/0.1% ammonium hydroxide in methanol (85:15), to afford 480 mg (1.07 mmol, 72%) of product. 1H NMR (200 MHz,CD3OD): 0.63 (q,8 Hz,6H), 0.97 (t,8 Hz,9H), 1.14 (s,6H), 1.18 (d,6 Hz,3H), 2.05 (m,1H), 2.28 (d,2Hz,2H), 2.35-3.00 (m,5H), 4.01 (m,1H), 4.44 (dd;8,12 Hz;1H), 7.05 (d,8 Hz,1H), 7.10-7.35 (m,3H). FAB-MS: calculated for C24H41N3O3Si 447; found 448 (M+H, 100%).

Workup

  1. customthen partitioned between ethyl acetate and saturated aqueous sodium chloride (buffered to pH 9 with 2 drops of ammonium hydroxide)
  2. customThe organic layer was separated
  3. washwashed with buffered brine
  4. dry with materialdried over magnesium sulfate
  5. filtrationfiltered
  6. customsolvents evaporated under vacuum
  7. customThe residue was purified by preparative high pressure liquid chromatography on silica
  8. washeluting with ethyl acetate/0.1% ammonium hydroxide in methanol (85:15)

Sources & evidence

ORD record
ord-5843a026901c481687935262fd15f357
Source dataset
uspto-grants-1994_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US05310737

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes