1,1'-Carbonyldiimidazole → 3-Aminoquinuclidine

A suspension of 2-(4-chlorophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acid (5.0 g, 0.0174 mole), 1,1'-carbonyldiimidazole (2.82 g, 0.0174 mole) and dry tetrahydrofuran (100 ml) was stirred at room temperature for three hours with nitrogen bubbling through it. 3-Aminoquinuclidine dihydrochloride (20.8 g, 0.104 mole) and sodium methoxide (freshly prepared from 5.28 g of sodium metal in 50 ml of methanol) were stirred at room temperature for one hour. This second suspension was filtered and evaporated to an oil. The oil was extracted into boiling light petroleum ether (1500 ml) and the petroleum ether was then removed under reduced pressure to give 6,6 g of 3-aminoquinuclidine. The 3-aminoquinuclidine was dissolved in tetrahydrofuran (20 ml) and added to the solution containing the product resulting from the first suspension. The reaction mixture was stirred at room temperature under a nitrogen atmosphere overnight.

1. stirringwere stirred at room temperature for one hour
2. filtrationThis second suspension was filtered
3. customevaporated to an oil
4. extractionThe oil was extracted
5. customthe petroleum ether was then removed under reduced pressure

ORD record

ord-3186c2aafa8f47389700f40147f53d4e

Source dataset

uspto-grants-1990_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04948800