Pyridine → 2-Methylpropyl (2R)-4-[(3-chloropropyl)sulfonyloxy]-3,3-dimethyl-2-(phenylmethoxy)butanoate

HRID 1671441노트

반응식

HRID 1671441 반응식
[Cl:1][CH2:2][CH2:3][CH2:4][S:5]([O:8][CH2:9][C:10]([CH3:24])([CH3:23])[C@@H:11]([O:15][CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)[C:12]([OH:14])=[O:13])(=[O:7])=[O:6].C(Cl)(=O)C(Cl)=O.[CH3:31][CH:32]([CH3:35])[CH2:33]O.N1C=CC=CC=1>ClCCl>[Cl:1][CH2:2][CH2:3][CH2:4][S:5]([O:8][CH2:9][C:10]([CH3:24])([CH3:23])[C@@H:11]([O:15][CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)[C:12]([O:14][CH2:31][CH:32]([CH3:35])[CH3:33])=[O:13])(=[O:6])=[O:7]

참가 물질

6

반응물 4

HCID 1049PyridineHCID 6560IsobutanolHCID 65578Oxalyl chlorideHCID 86628870(2R)-4-[(3-Chloropropyl)sulfonyloxy]-3,3-dimethyl-2-(phenylmethoxy)butanoic acid

생성물 1

HCID 866290392-Methylpropyl (2R)-4-[(3-chloropropyl)sulfonyloxy]-3,3-dimethyl-2-(phenylmethoxy)butanoate수율 48%

시약·촉매·용매 1

HCID 6344Dichloromethane용매2회

실험 절차

Following the general procedure for the preparation of carboxylic esters from carboxylic acids of Description 15, (2R)-4-[(3-chloropropyl)sulfonyloxy]-3,3-dimethyl-2-(phenylmethoxy)butanoic acid (11) (1.1 g, 3.1 mmol) dissolved in 30 mL of dichloromethane was reacted with 1.8 mL (3.6 mmol) of oxalyl chloride (2.0 M in DCM). After completion of the reaction, a solution of 2-methylpropanol (0.57 mL, 0.46 g, 6.2 mmol) and 0.50 mL of pyridine (0.49 g, 6.2 mmol) in 20 mL of anhydrous dichloromethane (DCM) was added to the acid chloride. After work-up, the crude material was purified by silica gel column chromatography using a mixture of ethyl acetate (EtOAc) and hexane (Hxn) as eluent (EtOAc/Hxn=1:5) to provide 0.62 g (48% yield) of the title compound (30a) as a colorless oil. Rf=0.69 (EtOAc/Hxn=1:2). 1H NMR (400 MHz, CDCl3): δ=0.98 (d, J=6.4 Hz, 1H), 1.07 (s, 3H), 1.09 (s, 3H), 1.99 (septet, J=6.4 Hz, 1H), 2.25-2.34 (m, 2H), 3.22-3.26 (m, 2H), 3.64 (t, J=6.0 Hz, 2H), 3.86 (s, 1H), 3.89-4.01 (m, 3H), 4.23-4.25 (m, 1H), 4.35 (d, J=11.2 Hz, 1H), 4.64 (d, J=11.2 Hz, 1H), 7.29-7.39 (m, 5H) ppm. MS (ESI) m/z 435.16 (M+H)+, 457.11 (M+Na)+. The analytical data was consistent with the proposed structure.

후처리

  1. customAfter completion of the reaction
  2. customAfter work-up, the crude material was purified by silica gel column chromatography
  3. additiona mixture of ethyl acetate (EtOAc) and hexane (Hxn) as eluent (EtOAc/Hxn=1:5)

출처 및 근거

ORD 기록
ord-1440c098488949e6b658233adb96a896
출처 데이터셋
uspto-grants-2011_08
특허 번호
US07994218B2

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