2-Pyrrolidone → Levcromakalim

HRID 1980534

反応式

HRID 1980534 の反応式
C(C1C=CC2OC(C)(C)[C@@H](Br)[C@H](O)C=2C=1)#N.[H-].[Na+].[C:19]([C:21]1[CH:33]=[CH:32][C:24]2[O:25][C:26]([CH3:31])([CH3:30])[CH:27]3[O:29][CH:28]3[C:23]=2[CH:22]=1)#[N:20].[NH:34]1[CH2:38][CH2:37][CH2:36][C:35]1=[O:39]>CS(C)=O.O>[C:19]([C:21]1[CH:33]=[CH:32][C:24]2[O:25][C:26]([CH3:31])([CH3:30])[C@@H:27]([OH:29])[C@H:28]([N:34]3[CH2:38][CH2:37][CH2:36][C:35]3=[O:39])[C:23]=2[CH:22]=1)#[N:20]

参加物

7

反応物 4

HCID 120252-PyrrolidoneHCID 24758Sodium hydride2 回HCID 6932483trans-2,2-Dimethyl-3-bromo-6-cyanochroman-4-olHCID 108673602,2-Dimethyl-3,4-epoxy-6-cyanochroman

生成物 1

HCID 93504Levcromakalim収率 60%

試薬・触媒・溶媒 2

HCID 679Dimethyl Sulfoxide溶媒HCID 962Water溶媒

実験手順

A solution of 6-cyano-3,4-dihydro-2,2-dimethyltrans-3-bromo-4-hydroxy-2H-benzo[b]pyran (4 g, 14.2 mM) in dimethylsulphoxide (20 ml) was stirred and sodium hydride (60% dispersion in oil, 0.6 g, 15 mM) added. The suspension was stirred for 1 hour when a solution of 6-cyano-3,4-dihydro-2,2-dimethyl-3,4-epoxy-2H-benzo[b]-pyran resulted. 2-Pyrrolidone (1.8 g, 21 mM) and further sodium hydride (0.8 g, 21 mM) were introduced and the mixture stirred at room temperature for an additional 16 hours. Water (40 ml) was slowly added to the mixture to induce crystallisation of the product after which it was cooled in ice and filtered under suction. Crystallisation from ethanol (20 ml) gave the title compound as a cream coloured solid in 60% yield. Recrystallisation from ethyl acetate afforded the pure product as needles, m.p. 226.5-227.5< having an nmr spectrum and t.l.c. characteristics identical to those of the compound of Description 6.

後処理

  1. customresulted
  2. customcrystallisation of the product after which it
  3. temperaturewas cooled in ice
  4. filtrationfiltered under suction
  5. customCrystallisation from ethanol (20 ml)

出典と根拠

ORDレコード
ord-c74395cbd75f4a54929747550f64e00e
出典データセット
uspto-grants-1985_04
特許番号
US04510152

関連ノート

読み込み中…