Dimethyl Sulfate → Methyl 2-chloro-5-(trifluoromethyl)benzoate

HRID 974206ノート

反応式

HRID 974206 の反応式
O[CH:2](C)CN(CC(O)C)CC(O)C.[Cl:14][C:15]1[CH:23]=[CH:22][C:21]([C:24]([F:27])([F:26])[F:25])=[CH:20][C:16]=1[C:17]([OH:19])=[O:18].COS(OC)(=O)=O>CC(C)=O.O.Cl>[Cl:14][C:15]1[CH:23]=[CH:22][C:21]([C:24]([F:25])([F:26])[F:27])=[CH:20][C:16]=1[C:17]([O:19][CH3:2])=[O:18]

参加物

7

反応物 3

HCID 6497Dimethyl SulfateHCID 24730TriisopropanolamineHCID 6881822-Chloro-5-(trifluoromethyl)benzoic acid

生成物 1

HCID 15010065Methyl 2-chloro-5-(trifluoromethyl)benzoate収率 96%

試薬・触媒・溶媒 3

HCID 180Acetone溶媒HCID 313Hydrochloric Acid溶媒HCID 962Water溶媒2 回

実験手順

A sample of 620 g (3.25 moles) of tris-(2-hydroxypropyl)amine was melted on a steam bath. This was added slowly to a solution of 615 g (2.75 moles) of 2-chloro-5-trifluoromethylbenzoic acid and 375 g (282 ml, 2.98 moles) of dimethylsulfate in 750 ml of acetone in a 5 liter flask. (The solution began to boil during the course of the addition and was kept at 30° C. to 40° C. by intermittant cooling in an ice bath.) After addition was complete the solution was boilded on a steam bath for 30 minutes. The hot solution was diluted first with 250 ml water and, after 10 minutes, with 250 ml of 2N HCl and 750 ml of water and allowed to stir overnight. The solution was extracted with two 2 liter portions of dichloromethane and the organic extract was washed with saturated K2CO3 and water, dried over Na2SO4 and evaporated to afford 630 g (96%) of methyl 2-chloro-5-trifluoromethylbenzoate as a yellow liquid. TLC (silica gel, 10% CH2Cl2 -hexane) showed 1 spot (ester at Rf 0.4; this material was pure enough to be used in the next step without distillation. IR (NaCl, neat) 3080, 3000, 2960 (C--H), 1735 (C=O); NMR [CDCl3, (CH3)4Si] 3.78 (s, 3H, CH3 --), 7.27 (d, 1H, H-3, J3,4 =9), 7.43 (d of d, 1H, H-4, J3,4 =9, J4,6 -2.4), 7.80 (d, 1H, J4,6 -2.5); Mass Spectrum: m/e 240, 238 (1:3, M+), 209, 207 (1:3, M--OCH3), 181, 179 (1:3, M--CO22CH3). B.p. 95° C. at 4.5 torr.

後処理

  1. additionto boil during the course of the addition
  2. customwas kept at 30° C. to 40° C.
  3. temperatureby intermittant cooling in an ice bath
  4. addition) After addition
  5. extractionThe solution was extracted with two 2 liter portions of dichloromethane
  6. extractionthe organic extract
  7. washwas washed with saturated K2CO3 and water
  8. dry with materialdried over Na2SO4
  9. customevaporated

出典と根拠

ORDレコード
ord-9f98010ad5af4b1797e851c95cb9fe4a
出典データセット
uspto-grants-1991_11
特許番号
US05068248

反応ノート

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