Triphenylphosphine → (S)-methyl 5-methyl-2-(pent-4-en-2-yloxy)benzoate

HRID 921119

반응식

HRID 921119 반응식
[OH:1][C:2]1[CH:11]=[CH:10][C:9]([CH3:12])=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].[CH3:13][C@@H:14](O)[CH2:15][CH:16]=[CH2:17].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1.CCOCC>[CH3:12][C:9]1[CH:10]=[CH:11][C:2]([O:1][C@H:16]([CH2:15][CH:14]=[CH2:13])[CH3:17])=[C:3]([CH:8]=1)[C:4]([O:6][CH3:7])=[O:5]

참가 물질

7

반응물 4

HCID 11776TriphenylphosphineHCID 89802Methyl 5-methylsalicylateHCID 5363146Diisopropyl azodicarboxylateHCID 6999724(2R)-pent-4-en-2-ol

생성물 1

HCID 118307101(S)-methyl 5-methyl-2-(pent-4-en-2-yloxy)benzoate수율 90%

시약·촉매·용매 2

HCID 3283Diethyl Ether용매HCID 8028Tetrahydrofuran용매

실험 절차

To a solution of methyl 2-hydroxy-5-methylbenzoate (1.0 g, 6.02 mmol) in THF (14 ml) were added (R)-(−)-pent-4-en-2-ol (1.037 g, 12.04 mmol) and triphenylphosphine (2.052 g, 7.82 mmol). DIAD (1.521 ml, 7.82 mmol) was added dropwise (exotherm) and the mixture was stirred at rt. After 4.5 h, the mixture was diluted with Et2O and washed with 1N NaOH followed by water (3×'s) then brine, dried (Na2SO4), filtered and concentrated. The yellow oil was purified by flash chromatography (Biotage; 0%-100% EtOAc/hexane; 20 CV) to give (S)-methyl 5-methyl-2-(pent-4-en-2-yloxy)benzoate (1.2664 g, 5.41 mmol, 90% yield) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.58 (d, J=2.2 Hz, 1H), 7.23 (dd, J=8.3, 2.0 Hz, 1H), 6.90 (d, J=8.6 Hz, 1H), 6.03-5.77 (m, 1H), 5.21-4.99 (m, 2H), 4.61-4.35 (m, 1H), 3.89 (s, 3H), 2.60-2.46 (m, 1H), 2.46-2.34 (m, 1H), 2.34-2.25 (m, 3H), 1.34 (d, J=6.1 Hz, 3H).

후처리

  1. washwashed with 1N NaOH
  2. dry with materialdried (Na2SO4)
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customThe yellow oil was purified by flash chromatography (Biotage; 0%-100% EtOAc/hexane; 20 CV)

출처 및 근거

ORD 기록
ord-0623d862063447738561a0cabef1b5ef
출처 데이터셋
uspto-grants-2016_03
특허 번호
US09273067B2

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