Diisopropylamine → 1,3-Dimethyl-2,4-dioxo-6-((2-(trimethylsilyl)ethoxy)methyl)-2,3,4,6-tetrahydro-1H-pyrrolo[3,4-d]pyrimidin-5-ylboronic acid

Participants

Reaction Conditions

Reaction Steps

Butyl lithium (1.26M, 28.4 mL, 35.8 mmol) was added dropwise to a solution of diisopropylamine (3.63 g, 35.8 mmol) in THF (20 mL) at −78° C., keeping the internal temperature below −40° C. Once the addition was complete, the contents of the flask were allowed to warm to −5° C., then were re-cooled to −78° C. The resulting mixture was cannulated over a period of about 30 minutes into a suspension of 1,3-dimethyl-6-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (step 1) (6.93 g, 22.4 mmol) in THF (75 mL) at −78° C. The mixture was stirred at −78° C. for 30 minutes, then triisopropylborate (8.3 mL, 35.8 mmol) was added dropwise. The solution was stirred at −78° C. for 1.5 hours, then was quenched by carefully adding sat ammonium chloride (200 mL).

Provenance & Evidence