Water → (R)-tert-butyl 1-(4-fluorophenyl)-4a-(R/S)-(hydroxy(l-methyl-1H-pyrazol-4-yl)methyl)-4a,5,7,8-tetrahydro-1H-pyrazolo[3,4-g]isoquinoline-6(4H)-carboxylate

Participants

Reaction Steps

A second reaction was performed with inverse addition of n-butyl lithium. To a solution of 4-iodo-1-methyl-1H-pyrazole (157 mg, 0.755 mmol) in tetrahydrofuran (2 mL) was added n-butyl lithium (2.5 M in Hexanes) (312 μl, 0.780 mmol) at −78° C. The mixture was stirred at this temperature for 1 hour, then a solution of (R)-tert-butyl 1-(4-fluorophenyl)-4a-formyl-4a,5,7,8-tetrahydro-1H-pyrazolo[3,4-g]isoquinoline-6(4H)-carboxylate (100 mg, 0.252 mmol) in tetrahydrofuran (1 mL) was added dropwise to the reaction mixture. The mixture was stirred at this temperature for 30 minutes. Water (6 mL) and dichloromethane (8 mL) were added and the phases were separated using a phase separator cartridge. The solvent was removed in vacuo to give an orange oil, with a similar composition to the previous reaction product according to LC/MS analysis.

Provenance & Evidence