Methyl iodide → 1-Benzenesulfonyl-4-bromo-2-methyl-1H-pyrrolo[3,2-c]pyridine

Temperatur

-35 °C

A 50 mL round-bottomed flask, under nitrogen, fitted with a thermometer probe and a condenser/inert gas bubbler (via a Claisen head) was charged with a solution of 1-benzenesulfonyl-4-bromo-1H-pyrrolo[3,2-c]pyridine (0.43 g, 1.27 mmol) in anhydrous THF (8 mL). To the resultant solution, at −35° C., was added dropwise a solution of lithium diisopropylamide (2.0M in heptane/THF/ethyl benzene, 1.27 mL, 2.54 mmol) and the mixture was stirred at −35° C. for 30 min. Methyl iodide (0.48 mL, 7.63 mmol) was added dropwise and solution was allowed to reach room temperature and stirred for 3 h. The reaction was quenched by addition of 1N HCl (3 mL). The solution was diluted with water (7 mL), extracted with EtOAc (2×50 mL). The organic extracts were pooled, was dried (Na2SO4) and concentrated in vacuo. The resultant residue was purified by flash chromatography (Si—PPC, 0-100% EtOAc:cyclohexane) to give the desired product (0.43 g, 96%) as a white powder. LCMS (Method A) RT=4.67 min, [M+H]+ 351 (79Br), 353 (8Br)

1. customA 50 mL round-bottomed flask, under nitrogen, fitted with a thermometer probe
2. customto reach room temperature
3. stirringstirred for 3 h
4. customThe reaction was quenched by addition of 1N HCl (3 mL)
5. additionThe solution was diluted with water (7 mL)
6. extractionextracted with EtOAc (2×50 mL)
7. dry with materialwas dried (Na2SO4)
8. concentrationconcentrated in vacuo
9. customThe resultant residue was purified by flash chromatography (Si—PPC, 0-100% EtOAc:cyclohexane)

ORD-Eintrag

ord-9007a0c8ce644138a9a66bc665612cb9

Quelldatensatz

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08173650B2