2,6-Lutidine → ethyl (4S)-4-{[(benzyloxy)carbonyl]amino}-3-{[tert-butyl(dimethyl)silyl]oxy}-5-methylhexanoate

HRID 906956ノート

反応式

HRID 906956 の反応式
[CH2:1]([O:8][C:9]([NH:11][C@@H:12]([CH:21]([CH3:23])[CH3:22])[CH:13]([OH:20])[CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.N1C(C)=CC=CC=1C.[CH3:32][C:33]([Si:36](OS(C(F)(F)F)(=O)=O)([CH3:38])[CH3:37])([CH3:35])[CH3:34]>C1COCC1>[CH2:1]([O:8][C:9]([NH:11][C@@H:12]([CH:21]([CH3:22])[CH3:23])[CH:13]([O:20][Si:36]([C:33]([CH3:35])([CH3:34])[CH3:32])([CH3:38])[CH3:37])[CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

参加物

5

反応物 3

HCID 79372,6-LutidineHCID 123564tert-Butyldimethylsilyl trifluoromethanesulphonateHCID 67390171ethyl (4S)-4-{[(benzyloxy)carbonyl]amino}-3-hydroxy-5-methylhexanoate

生成物 1

HCID 67390315ethyl (4S)-4-{[(benzyloxy)carbonyl]amino}-3-{[tert-butyl(dimethyl)silyl]oxy}-5-methylhexanoate収率 88.7%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

実験手順

Under an argon atmosphere, to a solution (228 mL) of ethyl (4S)-4-{[(benzyloxy)carbonyl]amino}-3-hydroxy-5-methylhexanoate (14.74 g) in dehydrated THF was added 2,6-lutidine (7.33 g) with stirring under ice-cooling, and tert-butyl dimethylsilyl trifluoromethanesulfonate (14.46 g) was added dropwise. The mixture was gradually warmed to room temperature and stirred for 1.5 hr. The reaction mixture was poured into ice water, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=19/1→4/1) to give ethyl (4S)-4-{[(benzyloxy)carbonyl]amino}-3-{[tert-butyl(dimethyl)silyl]oxy}-5-methylhexanoate as colorless oil (yield: 17.7 g).

後処理

  1. temperaturecooling
  2. stirringstirred for 1.5 hr
  3. extractionthe mixture was extracted with ethyl acetate
  4. washThe organic layer was washed with saturated brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. concentrationconcentrated
  7. customThe residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=19/1→4/1)

出典と根拠

ORDレコード
ord-c8b22f40baf244979c71ff8683c6421b
出典データセット
uspto-grants-2011_09
特許番号
US08013008B2

反応ノート

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