Benzylamine → HCID 178455053, compound

HRID 1180668Notes

Reaction equation

HRID 1180668 reaction equation
[Si:1]([O:8][C:9]1[CH:14]=[C:13]([O:15][Si:16]([C:19]([CH3:22])([CH3:21])[CH3:20])([CH3:18])[CH3:17])[CH:12]=[CH:11][C:10]=1[CH:23]1[CH2:28][CH2:27][C:26](=O)[CH2:25][CH2:24]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[CH2:30]([NH2:37])[C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.C[N+](C)(C)C.[OH-].[Na+]>ClCCCl>[CH2:30]([NH:37][C@H:26]1[CH2:27][CH2:28][C@@H:23]([C:10]2[CH:11]=[CH:12][C:13]([O:15][Si:16]([C:19]([CH3:21])([CH3:22])[CH3:20])([CH3:17])[CH3:18])=[CH:14][C:9]=2[O:8][Si:1]([C:4]([CH3:6])([CH3:5])[CH3:7])([CH3:2])[CH3:3])[CH2:24][CH2:25]1)[C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1

Participants

6

Reactant 4

HCID 7504BenzylamineHCID 14798Sodium HydroxideHCID 13696215Tetramethylammonium Triacetoxyborohydride (>90%)HCID 223378144-(2,4-Bis{[tert-butyl(dimethyl)silyl]oxy}phenyl)cyclohexan-1-one

Product 1

HCID 178455053HCID 178455053, compoundYield 70%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent2×

Procedure

To a flask equipped with magnetic stirrer was loaded 4-(2,4-bis{[tert-butyl(dimethyl)silyl]oxy}phenyl)cyclohexanone (3.20 g, 7.36 mmol). Anhydrous 1,2-dichloroethane (85 ml) was added, followed by benzylamine (0.97 ml, 8.83 mmol) as a solution in 1,2-dichloroethane (20 ml). Activated powdered 4Å molecular sieves (5.80 g) were added and the reaction mixture stirred vigorously for 2.5 hr. Tetramethylammoniumtriacetoxyborohydride (2.90 g, 11.0 mmol) was added in one portion and the reaction mixture stirred for 64 hr. Aqueous sodium hydroxide solution (30 ml, 0.4M) was added and vigorous stirring was continued for 0.5 hr. The reaction mixture was then filtered through celite, washing with dichloromethane (100 ml). The layers were separated and the aqueous layer was extracted with dichloromethane (2×50 ml). The combined organic phases were washed with brine (100 ml), dried (MgSO4), filtered and concentrated in vacuo affording the crude product. Purification via FCC (SiO2, ethyl acetate/petroleum ether, gradient elution using 1:9, 1:4, then 3:7 v/v) furnished the title compound (2.69 g, 70%) as a pale yellow oil. δH(CDCl3) 0.01 (6H, s), 0.05 (6H, s), 0.77 (9H, s), 0.83 (9H, s), 1.31 (1H, br), 1.39 (4H, m), 1.52 (2H, m), 1.70 (2H, m), 2.69 (1H, m), 2.75 (1H, m), 6.10 (1H, d), 6.23 (1H, dd), 6.84 (1H, d), 7.15 (5H, m).

Workup

  1. customTo a flask equipped with magnetic stirrer
  2. additionwere added
  3. stirringthe reaction mixture stirred for 64 hr
  4. stirringvigorous stirring
  5. waitwas continued for 0.5 hr
  6. filtrationThe reaction mixture was then filtered through celite
  7. washwashing with dichloromethane (100 ml)
  8. customThe layers were separated
  9. extractionthe aqueous layer was extracted with dichloromethane (2×50 ml)
  10. washThe combined organic phases were washed with brine (100 ml)
  11. dry with materialdried (MgSO4)
  12. filtrationfiltered
  13. concentrationconcentrated in vacuo
  14. customaffording the crude product
  15. customPurification via FCC (
  16. washSiO2, ethyl acetate/petroleum ether, gradient elution

Sources & evidence

ORD record
ord-8fba38dd345a4c69b34c77605f1b6918
Source dataset
uspto-grants-2007_10
Patent number
US07282592B2

Reaction notes

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