Trimethyl orthoacetate → Methyl 6-bromo-6-chloro-3,3-dimethyl-7,7,7-trifluorohept-4-enoate

HRID 1246

反応式

HRID 1246 の反応式
[Br:1][C:2]([Cl:13])([C:9]([F:12])([F:11])[F:10])[CH:3](O)[CH:4]=[C:5]([CH3:7])[CH3:6].[C:14](OC)([O:18][CH3:19])([O:16]C)[CH3:15]>O.[O-2].[O-2].[O-2].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.[Al+3].[Al+3]>[Br:1][C:2]([Cl:13])([C:9]([F:10])([F:11])[F:12])[CH:3]=[CH:4][C:5]([CH3:7])([CH3:6])[CH2:15][C:14]([O:18][CH3:19])=[O:16]

参加物

4

反応物 2

HCID 15050Trimethyl orthoacetateHCID 152193461,1,1-Trifluoro-2-bromo-2-chloro-5-methyl-4-hexen-3-ol

生成物 1

HCID 54451067Methyl 6-bromo-6-chloro-3,3-dimethyl-7,7,7-trifluorohept-4-enoate収率 65%

試薬・触媒・溶媒 1

HCID 71586775Bentonite触媒

反応条件

温度
111 °C

実験手順

5-Bromo-5-chloro-4-hydroxy-2-methyl-6,6,6-trifluorohex-2-ene (10.0 g), trimethyl orthoacetate (16.0 g) and Montmorillonite KSF (0.5 g) were charged to a round-bottomed flask fitted with: nitrogen inlet/bubbler, thermometer and still-head. The mixture was heated with agitation, and the methanol-trimethyl orthoacetate distillates were collected until the reactor temperature increased to 111° C. (ca. 1 hr). The reaction was then heated to 135° C. and held for a further 1 hour. The methanol/trimethyl orthoacetate distillates were recharged and the distillation procedure repeated twice. Once the reaction was complete, the Montmorillonite was removed by filtration. The residual trimethyl orthoacetate was then removed by distillation under vacuum (ca. 50° C. @ 100 mmHg) to give the product, methyl 6-bromo-6-chloro-3,3-dimethyl-7,7,7-trifluorohept-4-enoate as a brown oil (7.8 g, 59% yield).

後処理

  1. customfitted with: nitrogen inlet/bubbler
  2. temperatureThe mixture was heated with agitation
  3. distillationthe methanol-trimethyl orthoacetate distillates were collected until the reactor temperature
  4. temperatureThe reaction was then heated to 135° C.
  5. distillationthe distillation procedure
  6. customthe Montmorillonite was removed by filtration
  7. customThe residual trimethyl orthoacetate was then removed by distillation under vacuum (ca. 50° C. @ 100 mmHg)

出典と根拠

ORDレコード
ord-d60f1ea20aa0467e8d0f2bb79c4451e3
出典データセット
uspto-grants-1998_03
特許番号
US05723649

関連ノート

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