Boron trifluoride → Dibenzyl 2,3,4-tri-O-benzyl-alpha-L-fucopyranosyl phosphate

HRID 1491950ノート

反応式

HRID 1491950 の反応式
[CH2:1]([O:8][C@H:9]1[C@H:15]([O:16][CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C@H:14]([O:24][CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[C@H:13]([CH3:32])[O:12][CH:10]1[OH:11])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[P:33]([O-])([O:43][CH2:44][C:45]1[CH:50]=[CH:49][CH:48]=[CH:47][CH:46]=1)([O:35][CH2:36][C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1)=[O:34].B(F)(F)F>ClCCl>[P:33]([O:11][C@@H:10]1[O:12][C@@H:13]([CH3:32])[C@@H:14]([O:24][CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[C@@H:15]([O:16][CH2:17][C:18]2[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=2)[C@@H:9]1[O:8][CH2:1][C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1)([O:35][CH2:36][C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1)([O:43][CH2:44][C:45]1[CH:50]=[CH:49][CH:48]=[CH:47][CH:46]=1)=[O:34]

参加物

5

反応物 3

HCID 6356Boron trifluorideHCID 2734155(3S,4R,5R,6S)-3,4,5-Tris(benzyloxy)-6-methyltetrahydro-2H-pyran-2-olHCID 4193600Dibenzylphosphate2 回

生成物 1

HCID 14216871Dibenzyl 2,3,4-tri-O-benzyl-alpha-L-fucopyranosyl phosphate収率 90%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

実験手順

A solution of 2,3,4-tri-O-benzyl-L-fucopyranose (prepared, for example, according to Wegmann et al., supra.) (0.50 g, 0.86 mmol) in 20 ml of dry dichloromethane and commercially available dibenzyl phosphate which is not further purified (0.24 g, 0.86 mmol) is stirred under a nitrogen atmosphere at room temperature for about 2 h. In the case of very pure dibenzyl phosphate, a catalytic amount of boron trifluoride is added to the mixture. The solution is then concentrated and purified by chromatography (toluene/acetone 9:1). Dibenzyl 2,3,4-tri-O-benzyl-α-L-fucopyranosyl phosphate (4) is obtained in a yield of 90% as a colorless oil (0.54 g). TLC (toluene/acetone 7:1) gives an Rf of 0.60, [α]578 =-68.2 (c=1, chloroform).

後処理

  1. concentrationThe solution is then concentrated
  2. custompurified by chromatography (toluene/acetone 9:1)

出典と根拠

ORDレコード
ord-47fe3aaea6e44cd794e8be7ff1fc673e
出典データセット
uspto-grants-1994_12
特許番号
US05371203

反応ノート

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