Water → 6-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1,4-dioxaspiro[4.5]dec-6-ene

HRID 337841

반응식

HRID 337841 반응식
I[C:2]1[C:3]2([CH2:8][CH2:9][CH2:10][CH:11]=1)[O:7][CH2:6][CH2:5][O:4]2.C([Li])CCC.[CH3:17][C:18]1([CH3:29])[C:22]([CH3:24])([CH3:23])[O:21][B:20](OC(C)C)[O:19]1.O>C1COCC1>[CH3:17][C:18]1([CH3:29])[C:22]([CH3:24])([CH3:23])[O:21][B:20]([C:2]2[C:3]3([CH2:8][CH2:9][CH2:10][CH:11]=2)[O:7][CH2:6][CH2:5][O:4]3)[O:19]1

참가 물질

6

반응물 4

HCID 962WaterHCID 50177412-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneHCID 146318076-Iodo-1,4-dioxaspiro[4.5]dec-6-eneHCID 178418339Butyllithium

생성물 1

HCID 899634516-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1,4-dioxaspiro[4.5]dec-6-ene수율 56%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

반응 조건

온도
-78 °C

실험 절차

To a solution of 6-iodo-1,4-dioxaspiro[4.5]dec-6-ene (Synlett, 2008, 1086-1090; 2.70 g, 10.2 mmol) in THF (30 mL), butyl lithium (1.65 M solution in hexane; 6.7 mL, 11.1 mmol) was added at −78° C. The reaction solution was stirred at −78° C. for 1 hour. Then, 4,4,5,5-tetramethyl-2-(propan-2-yloxy)-1,3,2-dioxaborolane (4.0 mL, 19.8 mmol) was added thereto, and the mixture was stirred at −78° C. for 2 hours. To the reaction solution, water (50 mL) was added, followed by extraction with ethyl acetate (50 mL). The thus obtained organic layer was dried over anhydrous sodium sulfate. After vacuum concentration, the residue was purified with silica gel chromatography (hexane/ethyl acetate=9:1) to yield the title compound (1.52 g, 56%) as a colorless oil.

후처리

  1. stirringthe mixture was stirred at −78° C. for 2 hours
  2. extractionfollowed by extraction with ethyl acetate (50 mL)
  3. dry with materialThe thus obtained organic layer was dried over anhydrous sodium sulfate
  4. concentrationAfter vacuum concentration
  5. customthe residue was purified with silica gel chromatography (hexane/ethyl acetate=9:1)

출처 및 근거

ORD 기록
ord-beb2518ec90842ddbc94d74f4d5a8283
출처 데이터셋
uspto-grants-2014_11
특허 번호
US08889741B2

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