Ethanol → 5-Cnac

反応式

[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[O:10]C(=O)[N:8]([CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][C:19]([O:21]CC)=[O:20])[C:7](=[O:24])[C:6]=2[CH:25]=1.C(O)C.[OH-].[Na+]>O>[Cl:1][C:2]1[CH:25]=[C:6]([C:7]([NH:8][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][C:19]([OH:21])=[O:20])=[O:24])[C:5]([OH:10])=[CH:4][CH:3]=1

参加物

反応条件

温度: 40 °C

実験手順

Ethyl 8-(6-chloro-2H-1,3-benzoxazine-2,4(3H)-dionyl)octanoate (641 g, 1.7 mol) and ethyl alcohol (3200 ml) were added to a 22 liter, five neck flask. In a separate 5 liter flask, sodium hydroxide (NaOH) (288.5 g, 7.2 mol) was dissolved in deionized water (3850 ml). This mixture was added to the reaction mixture contained in the 22 liter flask. A temperature increase to 40° C. was noted. Heating of the reaction mixture was started and when the reaction temperature had increased to 50° C. it was noted that all of the solids in the reaction mixture had dissolved. A temperature of 50° C. was maintained in the reaction mixture for a period of 1.5 hours. The reaction flask was then set up for vacuum distillation. 2200 ml of distillate were collected at a vapor temperature of 55° C. (10 mm Hg) before the distillation was discontinued. The reaction flask was then placed in an ice/water bath and concentrated hydrochloric acid (HCl) (752 ml) was added over a period of 45 minutes. During this addition the reaction mixture was noted to have thickened somewhat and an additional 4 liters of deionized water was added to aid the stirring of the reaction mixture. The reaction mixture was then vacuum filtered and the filter cake was washed with 3 liters of deionized water. After drying in vacuo at room temperature 456.7 g (83.5%) of N-(5-chlorosalicyloyl)-8-aminocaprylic acid was isolated.