Reaction #67401

Reaction equation

water

benzo[1,3]dioxole-5-acetonitrile

1-bromo-2-chloro-ethane

sodium hydroxide

→

solid

Yield 80.0%

1-Benzo[1,3]dioxol-5-yl-cyclopropanecarboxylic acid

Yield 80.0%

Conditions

Workup

1. 1
   Temperaturewas then heated at 130° C. for 48 hours
2. 2
   Extractionextracted once with an equal volume of ethyl acetate and once with an equal volume of dichloromethane
3. 3
   Filtrationthe precipitate was filtered
4. 4
   Washwashed with 1 M hydrochloric acid
5. 5
   workup.DISSOLUTIONThe solid material was dissolved in dichloromethane (400 mL)
6. 6
   Extractionextracted twice with equal volumes of 1 M hydrochloric acid and once with a saturated aqueous solution of sodium chloride
7. 7
   DryingThe organic solution was dried over sodium sulfate
8. 8
   Otherevaporated to dryness

Procedure

A mixture of benzo[1,3]dioxole-5-acetonitrile (5.10 g 31.7 mmol), 1-bromo-2-chloro-ethane (9.00 mL 109 mmol), and benzyltriethylammonium chloride (0.181 g, 0.795 mmol) was heated at 70° C. and then 50% (wt./wt.) aqueous sodium hydroxide (26 mL) was slowly added to the mixture. The reaction was stirred at 70° C. for 24 hours and was then heated at 130° C. for 48 hours. The dark brown reaction mixture was diluted with water (400 mL) and extracted once with an equal volume of ethyl acetate and once with an equal volume of dichloromethane. The basic aqueous solution was acidified with concentrated hydrochloric acid to pH less than one and the precipitate was filtered and washed with 1 M hydrochloric acid. The solid material was dissolved in dichloromethane (400 mL) and extracted twice with equal volumes of 1 M hydrochloric acid and once with a saturated aqueous solution of sodium chloride. The organic solution was dried over sodium sulfate and evaporated to dryness to give a white to slightly off-white solid (5.23 g, 80%) ESI-MS m/z calc. 206.1, found 207.1 (M+1)+. Retention time 2.37 minutes. NMR (400 MHz, DMSO-d6) δ 1.07-1.11 (m, 2H), 1.38-1.42 (m, 2H), 5.98 (s, 2H), 6.79 (m, 2H), 6.88 (m, 1H).

Source