Carbon Dioxide → HCID 117720084, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Add a 2M solution of lithium diisopropylamide in tetrahydrofuran (62.6 mL, 461.8 mmol) to tetrahydrofuran (1 L) at −78° C. Slowly add 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (19.94 mL, 164.91 mmol) followed by drop-wise addition of 3-chloro-2-methyl-benzonitrile (20 g, 131.93 mmol). Maintain the mixture at −78° C. with stirring for 5 min. Purge the reaction vessel with carbon dioxide (1 L; 25.65 moles) for 15 min. Add water (100 mL) and stir for 2 hr. Add 10M aqueous solution of sodium hydroxide to increase the pH of the aqueous phase to >12. Separate the aqueous layer and wash with diethyl ether. Acidify the aqueous layer with concentrated hydrochloric acid to pH-1 and extract with ethyl acetate. Separate the organic phase and dry over sodium sulfate. Filter and concentrate to dryness to yield the title compound as an off white solid (16.0 g; 81.80 mmol). MS (m/z): 195.9 (M+1).

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