Diisopropylethylamine → tert-butyl [(1S)-1-({[(1S)-1-benzyl-2-({(1R)-2-cyclobutyl-1-[(3aS,4S,6S,7aR)-3a,5,5-trimethylhexahydro-4,6-methano-1,3,2-benzodioxaborol-2-yl]ethyl}amino)-2-oxoethyl]amino}carbonyl)-3-phenylpropyl]carbamate

HRID 1182692Notes

Reaction equation

HRID 1182692 reaction equation
[NH2:1][C@@H:2]([CH2:25][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)[C:3]([NH:5][C@H:6]([B:12]1[O:16][C@@H:15]2[CH2:17][C@@H:18]3[CH2:21][C@H:20]([C@:14]2([CH3:24])[O:13]1)[C:19]3([CH3:23])[CH3:22])[CH2:7][CH:8]1[CH2:11][CH2:10][CH2:9]1)=[O:4].[CH3:32][C:33]([O:36][C:37]([NH:39][C@H:40]([C:49](O)=[O:50])[CH2:41][CH2:42][C:43]1[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=1)=[O:38])([CH3:35])[CH3:34].CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.[B-](F)(F)(F)F.C(N(CC)C(C)C)(C)C>CN(C=O)C>[CH2:25]([C@H:2]([NH:1][C:49]([C@@H:40]([NH:39][C:37](=[O:38])[O:36][C:33]([CH3:34])([CH3:32])[CH3:35])[CH2:41][CH2:42][C:43]1[CH:44]=[CH:45][CH:46]=[CH:47][CH:48]=1)=[O:50])[C:3]([NH:5][C@H:6]([B:12]1[O:16][C@@H:15]2[CH2:17][C@@H:18]3[CH2:21][C@H:20]([C@:14]2([CH3:24])[O:13]1)[C:19]3([CH3:23])[CH3:22])[CH2:7][CH:8]1[CH2:11][CH2:10][CH2:9]1)=[O:4])[C:26]1[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 2733207O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 7018726(2S)-2-(((tert-butoxy)carbonyl)amino)-4-phenylbutanoic acidHCID 68524856(2S)-2-amino-N-{(1R)-2-cyclobutyl-1-[(3aS,4S,6S,7aR)-3a,5,5-trimethylhexahydro-4,6-methano-1,3,2-benzodioxaborol-2-yl]ethyl}-3-phenylpropanamide

Product 1

HCID 86725188tert-butyl [(1S)-1-({[(1S)-1-benzyl-2-({(1R)-2-cyclobutyl-1-[(3aS,4S,6S,7aR)-3a,5,5-trimethylhexahydro-4,6-methano-1,3,2-benzodioxaborol-2-yl]ethyl}amino)-2-oxoethyl]amino}carbonyl)-3-phenylpropyl]carbamateYield 85%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent2×

Procedure

Into a 1-neck round-bottom flask was added (2S)-2-amino-N-{(1R)-2-cyclobutyl-1-[(3aS,4S,6S,7aR)-3a,5,5-trimethylhexahydro-4,6-methano-1,3,2-benzodioxaborol-2-yl]ethyl}-3-phenylpropanamide (217 mg, 0.511 mmol), Boc-homophe-OH (171 mg, 0.614 mmol), TBTU (246 mg, 0.767 mmol) and then N,N-dimethylformamide (14.5 mL, 0.187 mol) followed by N,N-diisopropylethylamine (0.187 mL, 1.07 mmol) dropwise at room temperature. The mixture was stirred at room temperature overnight The DMF was removed from the reaction mixture under vacuum and the resulting residue purified by preparative TLC in 40% EtOAc/Hexanes to give 298 mg (85% yield) of the desired product as a white solid.

Workup

  1. customwas removed from the reaction mixture under vacuum
  2. customthe resulting residue purified by preparative TLC in 40% EtOAc/Hexanes

Sources & evidence

ORD record
ord-ac6a2e62e2ba4f21bbec627da60afbb6
Source dataset
uspto-grants-2014_03
Patent number
US08664200B2

Reaction notes

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