3,4-Dichlorobenzaldehyde → ethyl 2-(3-(3,4-dichlorobenzylamino)propyl)-2-(N-methylacetamido)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanoate

HRID 579543Notes

Reaction equation

HRID 579543 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][C:9]=1[Cl:10])[CH:5]=O.Cl.[NH2:12][CH2:13][CH2:14][CH2:15][C:16]([N:35]([CH3:39])[C:36](=[O:38])[CH3:37])([CH2:22][CH2:23][CH2:24][CH2:25][B:26]1[O:30][C:29]([CH3:32])([CH3:31])[C:28]([CH3:34])([CH3:33])[O:27]1)[C:17]([O:19][CH2:20][CH3:21])=[O:18].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCl>[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][C:9]=1[Cl:10])[CH2:5][NH:12][CH2:13][CH2:14][CH2:15][C:16]([N:35]([CH3:39])[C:36](=[O:38])[CH3:37])([CH2:22][CH2:23][CH2:24][CH2:25][B:26]1[O:30][C:29]([CH3:31])([CH3:32])[C:28]([CH3:33])([CH3:34])[O:27]1)[C:17]([O:19][CH2:20][CH3:21])=[O:18]

Participants

5

Reactant 3

HCID 227103,4-DichlorobenzaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 66832929ethyl 2-(3-aminopropyl)-2-(N-methylacetamido)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanoate hydrochloride

Product 1

HCID 66832776ethyl 2-(3-(3,4-dichlorobenzylamino)propyl)-2-(N-methylacetamido)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanoateYield 53.8%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of 3,4-dichlorobenzaldehyde (55 mg, 0.31 mmol) and ethyl 2-(3-aminopropyl)-2-(N-methylacetamido)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanoate hydrochloride (120 mg, 0.26 mmol) in dichloromethane (3 mL) was stirred at room temperature. After 30 min, sodium triacetoxyborohydride (138 mg, 0.65 mmol) was added in one portion and stirring was continuated overnight. Once complete, the solution was diluted with dichloromethane (10 mL), quenched with aq 5% NaHCO3 (W/V, 5 mL) and stirred vigorously for 30 min. The layers were separated and the organic phase was washed with water and sat'd aq sodium chloride, dried over MgSO4, filtered and concentrated. Purification by flash column chromatography (2-20% methanol in dichloromethane) gave ethyl 2-(3-(3,4-dichlorobenzylamino)propyl)-2-(N-methylacetamido)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanoate (78 mg). ESI MS found for C27H43BCl2N2O5 m/z [557.6/559.6 (M+1)].

Workup

  1. waitwas continuated overnight
  2. customquenched with aq 5% NaHCO3 (W/V, 5 mL)
  3. stirringstirred vigorously for 30 min
  4. customThe layers were separated
  5. washthe organic phase was washed with water
  6. dry with materialdried over MgSO4
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customPurification by flash column chromatography (2-20% methanol in dichloromethane)

Sources & evidence

ORD record
ord-408610fb4a78450db2c62668b4e58c30
Source dataset
uspto-grants-2015_05
Patent number
US09040703B2

Reaction notes

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