Benzaldehyde → 2-acetamido-2-(1-benzylpiperidin-4-yl)-N-tert-butyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanamide

HRID 579606Notes

Reaction equation

HRID 579606 reaction equation
[C:1]([NH:4][C:5]([CH:26]1[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]1)([CH2:13][CH2:14][CH2:15][CH2:16][B:17]1[O:21][C:20]([CH3:23])([CH3:22])[C:19]([CH3:25])([CH3:24])[O:18]1)[C:6]([NH:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])(=[O:3])[CH3:2].[CH:32](=O)[C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl>[C:1]([NH:4][C:5]([CH:26]1[CH2:31][CH2:30][N:29]([CH2:32][C:33]2[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=2)[CH2:28][CH2:27]1)([CH2:13][CH2:14][CH2:15][CH2:16][B:17]1[O:18][C:19]([CH3:25])([CH3:24])[C:20]([CH3:22])([CH3:23])[O:21]1)[C:6]([NH:8][C:9]([CH3:12])([CH3:10])[CH3:11])=[O:7])(=[O:3])[CH3:2]

Participants

5

Reactant 3

HCID 240BenzaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 668337692-Acetamido-N-(tert-butyl)-2-(piperidin-4-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanamide

Product 1

HCID 668334062-acetamido-2-(1-benzylpiperidin-4-yl)-N-tert-butyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanamideYield 93%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Procedure

A solution of 2-acetamido-N-tert-butyl-2-(piperidin-4-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanamide (480 mg, 1.10 mmol) and benzaldehyde (138 mg, 131 jut, 1.30 mmol) in 1,2-dichloroethane (1 mL) was stirred for 20 minutes then treated with sodium triacetoxyborohydride (420 mg, 2.20 mmol). After 5 hours, the reaction mixture was quenched with saturated aqueous sodium bicarbonate (10 mL), diluted with saturated aqueous sodium chloride (50 mL) and extracted with dichloromethane (3×40 mL). Organic layers were collected, dried over MgSO4, filtered and concentrated. MPLC purification (25 g column, 1-10% methanol in dichloromethane) gave 2-acetamido-2-(1-benzylpiperidin-4-yl)-N-tert-butyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)hexanamide as a colorless oil (538 mg, 93%), which was used immediately in the subsequent step (approximately 10% of the product had the boronic acid deprotected).

Workup

  1. customthe reaction mixture was quenched with saturated aqueous sodium bicarbonate (10 mL)
  2. additiondiluted with saturated aqueous sodium chloride (50 mL)
  3. extractionextracted with dichloromethane (3×40 mL)
  4. customOrganic layers were collected
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customMPLC purification (25 g column, 1-10% methanol in dichloromethane)

Sources & evidence

ORD record
ord-ed089573aced4fa795319d5e496c10de
Source dataset
uspto-grants-2015_05
Patent number
US09040703B2

Reaction notes

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