Potassium Carbonate → (E)-tert-butyl 2-chloro-5-(2-cyclopropylvinyl)phenylcarbamate

HRID 340322

反応式

HRID 340322 の反応式
Br[C:2]1[CH:3]=[CH:4][C:5]([Cl:16])=[C:6]([NH:8][C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])[CH:7]=1.[CH:17]1(/[CH:20]=[CH:21]/B2OC(C)(C)C(C)(C)O2)[CH2:19][CH2:18]1.C(=O)([O-])[O-].[K+].[K+]>C1(C)C=CC=CC=1.CCOC(C)=O.O>[Cl:16][C:5]1[CH:4]=[CH:3][C:2](/[CH:21]=[CH:20]/[CH:17]2[CH2:19][CH2:18]2)=[CH:7][C:6]=1[NH:8][C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12]

参加物

7

反応物 3

HCID 11430Potassium CarbonateHCID 16217940(E)-2-Cyclopropylethylene-1-boronic acid, pinacol esterHCID 57840526tert-butyl N-(5-bromo-2-chlorophenyl)carbamate

生成物 1

HCID 66875036(E)-tert-butyl 2-chloro-5-(2-cyclopropylvinyl)phenylcarbamate

試薬・触媒・溶媒 3

HCID 962Water溶媒HCID 1140Toluene溶媒HCID 8857Ethyl Acetate溶媒

反応条件

温度
100 °C

実験手順

A solution of tert-butyl 5-bromo-2-chlorophenylcarbamate (from the previous step) (1.0 eq.) and (E)-2-(2-cyclopropylvinyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (commercially available) (1.0 eq.) in toluene (0.2 M) was mixed with tetrakis(triphenyl-phosphine)palladium (5 mol %) and 2N aqueous potassium carbonate solution (2.0 eq.). The reaction was heated to 100° C. and stirred overnight. After cooling to ambient temperature, the reaction mixture was diluted with EtOAc and water. The two phases were separated, and the aqueous layer was extracted twice with EtOAc. The combined organic layers were washed with brine, dried over anhydrous MgSO4, and concentrated en vacuo. The crude product was purified by flash chromatography on a COMBIFLASH® system (ISCO) using 0-5% EtOAc/Hexanes to give (E)-tert-butyl 2-chloro-5-(2-cyclopropylvinyl)phenylcarbamate as a pale yellow solid.

後処理

  1. temperatureAfter cooling to ambient temperature
  2. customThe two phases were separated
  3. extractionthe aqueous layer was extracted twice with EtOAc
  4. washThe combined organic layers were washed with brine
  5. dry with materialdried over anhydrous MgSO4
  6. concentrationconcentrated en vacuo
  7. customThe crude product was purified by flash chromatography on a COMBIFLASH® system (ISCO)

出典と根拠

ORDレコード
ord-8d50b4717c1e48a1af72ed5a968e35c5
出典データセット
uspto-grants-2014_11
特許番号
US08895577B2

関連ノート

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