(4-Iodo-pyridin-3-YL)-carbamic acid tert-butyl ester → tert-Butyl N-(4-mesityl-3-pyridyl)carbamate

HRID 966017Notes

Reaction equation

HRID 966017 reaction equation
I[C:2]1[CH:7]=[CH:6][N:5]=[CH:4][C:3]=1[NH:8][C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12].[C:16]1([CH3:28])[CH:21]=[C:20]([CH3:22])[CH:19]=[C:18]([CH3:23])[C:17]=1OB(O)O.O.O.O.O.O.O.O.O.[OH-].[Ba+2].[OH-]>COCCOC.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:16]1([CH3:28])[CH:21]=[C:20]([CH3:22])[CH:19]=[C:18]([CH3:23])[C:17]=1[C:2]1[CH:7]=[CH:6][N:5]=[CH:4][C:3]=1[NH:8][C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12]

Participants

7

Reactant 3

HCID 15366413(4-Iodo-pyridin-3-YL)-carbamic acid tert-butyl esterHCID 17749109Barium hydroxide, octahydrateHCID 22237855Mesitylboric acid

Product 1

HCID 22249598tert-Butyl N-(4-mesityl-3-pyridyl)carbamateYield 115.1%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolvent

Procedure

A solution of tert-butyl N-(4-iodo-3-pyridyl)carbamate (20.0 g, 62 mmol), mesitylboric acid (10.2 g, 62 mmol), Pd(PPh3)4 (3.6 g, 3.12 mmol), barium hydroxide octahydrate (49.3 g, 47.3 mmol) in 1,2-dimethoxyethane (400 mL) and water (67 mL) was heated under reflux for six hours. The mixture was filtered through Celite, and the filtrate was diluted with ethyl acetate, washed with brine, dried over magnesium sulfate and evaporated, to give the title compound (containing 22.3 g of impurities) as pale brown crystals.

Workup

  1. temperatureunder reflux for six hours
  2. filtrationThe mixture was filtered through Celite
  3. additionthe filtrate was diluted with ethyl acetate
  4. washwashed with brine
  5. dry with materialdried over magnesium sulfate
  6. customevaporated

Sources & evidence

ORD record
ord-05d0e4de06ec47f7b02d07b9e739e9f6
Source dataset
uspto-grants-2005_10
Patent number
US06951865B2

Reaction notes

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