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Acetic Acid → Methyl 1-((6-(tert-butyldimethylsilyloxy)naphthalen-2-yl)methyl)azetidine-3-carboxylate

HRID 713926
Notes
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Reaction equation

HRID 713926 reaction equation
[Si:1]([O:8][C:9]1[CH:10]=[C:11]2[C:16](=[CH:17][CH:18]=1)[CH:15]=[C:14]([CH:19]=O)[CH:13]=[CH:12]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].CC(O)=O.[NH:25]1[CH2:28][CH:27]([C:29]([O:31][CH3:32])=[O:30])[CH2:26]1.[BH3-]C#N.[Na+]>ClCCCl>[Si:1]([O:8][C:9]1[CH:10]=[C:11]2[C:16](=[CH:17][CH:18]=1)[CH:15]=[C:14]([CH2:19][N:25]1[CH2:28][CH:27]([C:29]([O:31][CH3:32])=[O:30])[CH2:26]1)[CH:13]=[CH:12]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:2])[CH3:3]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 5003444Sodium cyanoborohydrideHCID 20132751Methyl azetidine-3-carboxylateHCID 212993096-(Tert-butyldimethylsilyloxy)-2-naphthaldehyde

Product 1

HCID 66926610Methyl 1-((6-(tert-butyldimethylsilyloxy)naphthalen-2-yl)methyl)azetidine-3-carboxylateYield 50%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Conditions

Temperature
85 °C

Procedure

6-(tert-butyldimethylsilyloxy)-2-naphthaldehyde (4.0 g, 14 mmol), AcOH (1.8 g, 28 mmol) and methyl azetidine-3-carboxylate (3.2 g, 28 mmol, 2.0 equiv) in DCE (30 mL) were stirred at 85° C. for 1 h. Then NaBH3CN (1.8 g, 28 mmol, 2.0 equiv) was added to the mixture at 50° C. and stirred for 2 h at 85° C. The reaction mixture was quenched with water, extracted with DCM and washed with brine, dried over Na2SO4 and concentrated to obtain crude product. The crude product was purified by silica gel chromatography (DCM:MeOH=40:1) to give the title compound (2.7 g, 50%) as a yellow oil. ESI-MS (M+1)+: 386.2. 1H NMR (400 MHz, CDCl3) δ: 7.72-7.68 (m, 3H), 7.37-7.34 (m, 1H), 7.15-7.10 (m, 2H), 3.94 (s, 2H), 3.81-3.76 (m, 4H), 3.74 (s, 3H), 3.50-3.44 (m, 1H), 1.02 (s, 9H), 0.25 (s, 6H).

Workup

  1. customThe reaction mixture was quenched with water
  2. extractionextracted with DCM
  3. washwashed with brine
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated
  6. customto obtain crude product
  7. customThe crude product was purified by silica gel chromatography (DCM:MeOH=40:1)

Sources & evidence

ORD record
ord-6754d25f99804043a861718aef1af0a6
Source dataset
uspto-grants-2015_11
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09186367B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes