Chloroform → 2,3,4-Trifluorophenyl isothiocyanate
反応式
[F:1][C:2]1[C:7]([F:8])=[C:6]([F:9])[CH:5]=[CH:4][C:3]=1[NH:10][C:11](=S)[S-:12].C([NH+](CC)CC)C.ClC(OCC)=O.C(Cl)(Cl)Cl.C(Cl)Cl>C(N(CC)CC)C>[F:1][C:2]1[C:7]([F:8])=[C:6]([F:9])[CH:5]=[CH:4][C:3]=1[N:10]=[C:11]=[S:12]参加物
実験手順
That is, first 2,3,4-trifluoroaniline (V) is reacted with carbon disulfide in the presence of triethylamine to produce triethylammonium N-(2,3,4-trifluorophenyl)dithiocarbamate (VI). Then the compound (VI) is reacted with ethyl chloroformate in an organic solvent such as chloroform or methylene chloride in the presence of triethylamine to give 2,3,4-trifluorophenylisothiocyanate (VII). The compound (VII) is then reacted with di(lower alkyl) malonate sodium salt, which is prepared from di(lower alkyl) malonate and sodium hydride, in an organic solvent such as tetrahydrofuran or dioxane to give di(lower alkyl) [(2,3,4-trifluoroanilino)(mercapto)methylene]malonate sodium salt (VIII). The compound (VIII) is then reacted with 1-acetoxy-3-halogenoacetone in an organic solvent such as N,N-dimethylformamide, dimethylsulfoxide or acetonitrile to give di(lower alkyl) [(2,3,4-trifluoroanilino)(3-acetoxy-2-oxopropylthio)methylene]malonate (IX). The compound (IX) is then reacted with sulfuric acid to give di(lower alkyl) [3-(2,3,4-trifluorophenyl)-4-hydroxymethyl-2-thiazolidene]malonate (X). The compound (X) is then reacted with sodium hydride in an organic solvent such as dioxane, tetrahydrofuran or N,N-dimethylformamide to give di(lower alkyl) (6,7-difluoro-1H,4H-thiazolo[4,3-c][1,4]benzoxazin-1-ylidene)malonate (XI).
出典と根拠
- ORDレコード
- ord-fd72299689f9447f8619dfe93403379e
- 出典データセット
- uspto-grants-1989_02
- 特許番号
- US04808584
反応ノート
読み込み中…