Tetrahydrofuran → Ethyl 2-amino-3-t-butyldimethylsilyloxy-3-(2-chloropyridin-3-yl)propionate

HRID 1738257ノート

反応式

HRID 1738257 の反応式
[N:1]([CH:4]([CH:10]([O:18][Si:19]([C:22]([CH3:25])([CH3:24])[CH3:23])([CH3:21])[CH3:20])[C:11]1[C:12]([Cl:17])=[N:13][CH:14]=[CH:15][CH:16]=1)[C:5]([O:7][CH2:8][CH3:9])=[O:6])=[N+]=[N-].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.O1CCCC1>O>[NH2:1][CH:4]([CH:10]([O:18][Si:19]([C:22]([CH3:23])([CH3:25])[CH3:24])([CH3:21])[CH3:20])[C:11]1[C:12]([Cl:17])=[N:13][CH:14]=[CH:15][CH:16]=1)[C:5]([O:7][CH2:8][CH3:9])=[O:6]

参加物

5

反応物 3

HCID 8028TetrahydrofuranHCID 11776TriphenylphosphineHCID 23298343Ethyl 2-azido-3-t-butyldimethylsilyloxy-3-(2-chloropyridin-3-yl)propionate

生成物 1

HCID 23298326Ethyl 2-amino-3-t-butyldimethylsilyloxy-3-(2-chloropyridin-3-yl)propionate収率 113%

試薬・触媒・溶媒 1

HCID 962Water溶媒

実験手順

A mixture of 5.6 g of ethyl 2-azido-3-t-butyldimethylsilyloxy-3-(2-chloropyridin-3-yl)propionate (prepared as described in Preparation 77), 7.5 g of triphenylphosphine and 18 ml of a 8:1 by volume mixture of tetrahydrofuran and water was stirred at room temperature for 3 hours. At the end of this time, the reaction mixture was freed from the solvent by distillation. The residue was purified by column chromatography through silica gel, using a 5:1 by volume mixture of hexane and ethyl acetate and subsequently a 50:1 by volume mixture of methylene chloride and methanol as the eluent, to give 5.9 g of the title compound having Rf=0.59 (on silica gel thin layer chromatography using a 15:1 by volume mixture of methylene chloride and methanol as the developing solvent).

後処理

  1. distillationAt the end of this time, the reaction mixture was freed from the solvent by distillation
  2. customThe residue was purified by column chromatography through silica gel
  3. additionby volume mixture of hexane and ethyl acetate
  4. additionsubsequently a 50:1 by volume mixture of methylene chloride and methanol as the eluent

出典と根拠

ORDレコード
ord-78ccf7a8402444e681b2fec028538bdb
出典データセット
uspto-grants-1999_10
特許番号
US05962470

反応ノート

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