Triethylamine → Methyl-9-t-butyldiphenylsilyloxy-nonanoate

HRID 1393893Notes

Reaction equation

HRID 1393893 reaction equation
[CH3:1][O:2][C:3](=[O:13])[CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][OH:12].CCN(CC)CC.[C:21]([Si:25](Cl)([C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1)[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)([CH3:24])([CH3:23])[CH3:22].[NH4+].[Cl-]>C(Cl)Cl.CN(C1C=CN=CC=1)C>[CH3:1][O:2][C:3](=[O:13])[CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][O:12][Si:25]([C:21]([CH3:24])([CH3:23])[CH3:22])([C:32]1[CH:33]=[CH:34][CH:35]=[CH:36][CH:37]=1)[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 25517Ammonium ChlorideHCID 94078tert-ButyldiphenylchlorosilaneHCID 292983Nonanoic acid, 9-hydroxy-, methyl ester

Product 1

HCID 11133704Methyl-9-t-butyldiphenylsilyloxy-nonanoate

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Conditions

Temperature
25 °C

Procedure

A solution of methyl-9-hydroxy-nonanoate (0.838 g, 4.46 mmol, 1.0 equiv: Aldrich) in CH2Cl2 (15 mL, 0.3 M) was treated successively with Et3N (0.75 mL, 5.38 mmol, 1.2 equiv), t-butylchlorodiphenylsilane (1.28 mL, 4.93 mmol, 1.1 equiv), and DMAP (0.180 g, 1.48 mmol, 0.33 equiv), and the reaction mixture was stirred at 25° C. for 12 h. Saturated aqueous NH4Cl was added to the reaction mixture and the mixture was partitioned between CH2Cl2 (100 mL) and H2O (100 mL). The organic layer was dried (Na2SO4) and concentrated under reduced pressure. Chromatography (SiO2, 5 cm×15 cm, 0-5% EtOAc-hexanes gradient elution ) afforded the intermeidate as a clear, colorless oil (1.22g, 1.831 theoretical, 64.1%): 1H NMR (CDCl3, 250 MHz) δ 7.66 (m, 4H, ArH), 7.38 (m, 6H, ArH), 3.67-3.62 (m, 5H, C(O)OCH3 and CH2OTBDPS), 2.30 (t, 2H, J=7.4 Hz, CH2C(O)OCH3), 1.58 (m, 4H, CH2CH2OTBDPS and CH2CH2C(O)OCH3), 1.28 (b s, 8H, alkyl protons), 1.05 (s, 9H, C (CH3)3)

Workup

  1. customthe mixture was partitioned between CH2Cl2 (100 mL) and H2O (100 mL)
  2. dry with materialThe organic layer was dried (Na2SO4)
  3. concentrationconcentrated under reduced pressure
  4. washChromatography (SiO2, 5 cm×15 cm, 0-5% EtOAc-hexanes gradient elution )
  5. customafforded the intermeidate as a clear, colorless oil (1.22g, 1.831 theoretical, 64.1%)

Sources & evidence

ORD record
ord-414ca119551949d49d062b5f3b7a375b
Source dataset
uspto-grants-2008_03
Patent number
US07348173B2

Reaction notes

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