Water → 3beta-Tert-butyldimethylsilyloxy-14beta-methoxy-17beta-(3-furyl)-5beta-androstane

HRID 1647643ノート

反応式

HRID 1647643 の反応式
[Si:1]([O:8][C@H:9]1[CH2:26][CH2:25][C@@:24]2([CH3:27])[C@H:11]([CH2:12][CH2:13][C@@H:14]3[C@@H:23]2[CH2:22][CH2:21][C@@:19]2([CH3:20])[C@:15]3([OH:33])[CH2:16][CH2:17][C@@H:18]2[C:28]2[CH:32]=[CH:31][O:30][CH:29]=2)[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[CH3:34]I.O>O1CCCC1>[Si:1]([O:8][C@H:9]1[CH2:26][CH2:25][C@@:24]2([CH3:27])[C@H:11]([CH2:12][CH2:13][C@@H:14]3[C@@H:23]2[CH2:22][CH2:21][C@@:19]2([CH3:20])[C@:15]3([O:33][CH3:34])[CH2:16][CH2:17][C@@H:18]2[C:28]2[CH:32]=[CH:31][O:30][CH:29]=2)[CH2:10]1)([C:4]([CH3:5])([CH3:6])[CH3:7])([CH3:3])[CH3:2]

参加物

5

反応物 3

HCID 962WaterHCID 6328Methyl iodideHCID 700458673beta-Tert-butyldimethylsilyloxy-17beta-(3-furyl)-5beta-androstan-14beta-ol

生成物 1

HCID 700444293beta-Tert-butyldimethylsilyloxy-14beta-methoxy-17beta-(3-furyl)-5beta-androstane

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

反応条件

温度
70 °C

実験手順

To a solution of 10 g of 17β-(3-furyl)-5β-androstane-3β,14β-diol (II-a: Ref. comp.) (Minato H. and Nagasaki T., J. Chem. Soc. (C), 1966, 377)in 80 ml of dimethylformamide, 18 g of imidazole and 20.0 g of t-butyldimethylsilyl chloride were added at 0° C. After 12 hrs the mixture was poured into water and extracted with ethyl acetate. The organic layer was dried over sodium sulfate and evaporated to dryness under reduced pressure and 15 g of crude 3β-tert-butyldimethylsilyloxy-17β-(3-furyl)-5β-androstan-14β-ol were obtained. A suspension of this protected alcohol and 1.3 g of KH in 75 ml of tetrahydrofuran was heated at 70° C. for an hr; then 2.7 g of methyl iodide were added. After 30' the mixture was poured into water and extracted with ethyl acetate. The organic layer was dried over sodium sulfate and evaporated to dryness under reduced pressure to give 12 g of 3β-tert-butyldimethylsilyloxy-14β-methoxy-17β-(3-furyl)-5β-androstane as a white amorphous solid.

後処理

  1. extractionextracted with ethyl acetate
  2. dry with materialThe organic layer was dried over sodium sulfate
  3. customevaporated to dryness under reduced pressure

出典と根拠

ORDレコード
ord-7ed247ec814a47d381352fdaa09447ac
出典データセット
uspto-grants-1995_07
特許番号
US05432169

反応ノート

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