Octyltriphenylphosphonium bromide → (2S,3R,4S,5S)-3-(tert-butyldimethylsilyloxy)-4-methoxy-5-methyl-2-[(Z)-1-nonenyl]tetrahydro-2H-pyran

HRID 2399561

反応式

HRID 2399561 の反応式
[Br-].[CH2:2]([P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH3:9].[Li]CCCC.[CH3:34][O:35][C@H:36]1[C@@H:41]([CH3:42])[CH2:40][O:39][C@H:38]([CH:43]=O)[C@@H:37]1[O:45][Si:46]([C:49]([CH3:52])([CH3:51])[CH3:50])([CH3:48])[CH3:47]>C1COCC1.CN(P(N(C)C)(N(C)C)=O)C>[Si:46]([O:45][C@@H:37]1[C@@H:36]([O:35][CH3:34])[C@@H:41]([CH3:42])[CH2:40][O:39][C@H:38]1/[CH:43]=[CH:2]\[CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH3:9])([C:49]([CH3:52])([CH3:51])[CH3:50])([CH3:47])[CH3:48]

参加物

6

反応物 3

HCID 3084855Octyltriphenylphosphonium bromideHCID 57231418(2S,3R,4S,5S)-4-methoxy-5-methyl-3-(tert-butyldimethylsilyloxy)tetrahydro-2H-pyran-2-carbaldehydeHCID 178418339Butyllithium

生成物 1

HCID 67805109(2S,3R,4S,5S)-3-(tert-butyldimethylsilyloxy)-4-methoxy-5-methyl-2-[(Z)-1-nonenyl]tetrahydro-2H-pyran収率 90.8%

試薬・触媒・溶媒 2

HCID 8028Tetrahydrofuran溶媒2 回HCID 12679Hexamethylphosphoramide溶媒

反応条件

温度
0 °C

実験手順

To a stirred solution of n-octyltriphenylphosphonium bromide (2124 mg) in dry THF (10 ml) and dry HMPA (5 ml), there was added n-BuLi (4.0 ml, 1.6M in n-hexane) at 0° C. After the mixture was stirred at 0° C. for 30 min, a solution of (2S,3R,4S,5S)-4-methoxy-5-methyl-3-(tert-butyldimethylsilyloxy)tetrahydro-2H-pyran-2-carbaldehyde (497 mg) in dry THF (3 ml) was added to the resulting orange solution. The mixture was stirred at 0° C. for 30 min, and at room temperature for 2 hours. The reaction was quenched by addition of saturated aqueous ammonium chloride solution. The mixture was extracted with diethyl ether, and the combined ethereal extracts were washed with brine, dried over sodium sulfate, filtered, and concentrated. Purification of the residue by silica gel chromatography gave (2S,3R,4S,5S)-3-(tert-butyldimethylsilyloxy)-4-methoxy-5-methyl-2-[(Z)-1-nonenyl]tetrahydro-2H-pyran (602 mg, 72% yield).

後処理

  1. stirringThe mixture was stirred at 0° C. for 30 min
  2. waitat room temperature for 2 hours
  3. customThe reaction was quenched by addition of saturated aqueous ammonium chloride solution
  4. extractionThe mixture was extracted with diethyl ether
  5. washthe combined ethereal extracts were washed with brine
  6. dry with materialdried over sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customPurification of the residue by silica gel chromatography

出典と根拠

ORDレコード
ord-a9a10f0178f34d54ae45898b879aa968
出典データセット
uspto-grants-1995_09
特許番号
US05449785

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