反应详情

A solution of 1.27 g of ethyl 5-[1-(4-cyanobenzyl)imidazol-5-yl]-1-pent-2-enoate in 27 ml of tetrahydrofuran at 5° under nitrogen is treated with 0.52 g of potassium tert-butoxide. The reaction mixture is stirred at 5° for 2 h and 10 ml of 1N hydrochloric acid is added. The layers are separated. The organic phase is extracted with 1N hydrochloric acid (2×10 ml). The combined aqueous layers are extracted with ether, adjusted to pH=8 and extracted with methylene chloride (3×15 ml). The organic phase is dried and evaporated to yield the product which is treated with one molar equivalent of ethereal hydrogen chloride. The resulting solid is recrystallized from acetone to yield 5-(4-cyanophenyl)-6-ethoxycarbonylmethyl-5,6,7,8-tetrahydroimidazo[1,5-a]pyridine. m.p. 126°-127°.

1. customThe layers are separated
2. extractionThe organic phase is extracted with 1N hydrochloric acid (2×10 ml)
3. extractionThe combined aqueous layers are extracted with ether
4. extractionextracted with methylene chloride (3×15 ml)
5. customThe organic phase is dried
6. customevaporated
7. customto yield the product which
8. customThe resulting solid is recrystallized from acetone