3-Benzyl-5,6,7,8,9,10-hexahydro[1,2,4]triazolo[4,3-a]azocine → 3-(3-Methyl-1-phenylcyclobutyl)-5,6,7,8,9,10-hexahydro[1,2,4]triazolo[4,3-a]azocine

Participants

Reaction Conditions

Reaction Steps

3-Benzyl-5,6,7,8,9,10-hexahydro[1,2,4]triazolo[4,3-a]azocine (287.6 mg) and 1-bromo-3-chloro-2-methylpropane (140 μL) were dissolved in anhydrous, deoxygenated tetrahydrofuran, and the solution was cooled to −40° C. under an argon atmosphere. Potassium bis(trimethylsilyl)amide (KHMDS, 0.5M in toluene, 2.5 mL) was added dropwise. After 30 minutes, a second aliquot of KHMDS (2.5 mL) was added. After 30 additional minutes, KHMDS (2.15 mL) was added again, and the solution was allowed to slowly warm to room temperature. After one hour, the reaction was quenched with water and added to brine. After extraction with ethyl acetate, the organic layer was dried with magnesium sulfate, filtered, evaporated and purified by silica gel chromatography to give 3-[1-(4-chlorophenyl)-(Z)-3-(methoxymethoxy)cyclobutyl]-5,6,7,8,9,10-hexahydro[1,2,4]triazolo[4,3-a]azocine (4-10) as a ca. 1.2:1 mixture of isomers.

Provenance & Evidence