Reaction #675371

Reaction equation

triethylsilane

(R)-1-(4-methyl-3-oxo-1-trityl-2,3-dihydro-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea

Cs2CO3

4-iodotetrahydro-2H-pyran

→

(R)-1-(4-methyl-3-((tetrahydro-2H-pyran-4-yl)oxy)-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea

Solvents

DMSO

DMF

Conditions

Workup

1. 1
   OtherThe reaction was quenched with MeOH
2. 2
   Concentrationconcentrated in vacuo
3. 3
   workup.DISSOLUTIONThe residue was dissolved in TFA (2 mL)
4. 4
   workup.STIRRINGstirred at room temperature for 2 h
5. 5
   Otherpurified by mass-triggered reverse-phase HPLC
6. 6
   workup.ADDITIONFractions containing pure compound
7. 7
   Filtrationwere filtered through a PS—HCO3 cartridge
8. 8
   Concentrationthe filtrate was concentrated in vacuo

Procedure

A mixture of (R)-1-(4-methyl-3-oxo-1-trityl-2,3-dihydro-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea (50 mg, 0.090 mmol), Cs2CO3 (91 mg, 0.279 mmol), and 4-iodotetrahydro-2H-pyran (25 μL, 0.209 mmol) in DMF (1 mL) was stirred at room temperature for 18 h. The reaction was quenched with MeOH and concentrated in vacuo. The residue was dissolved in TFA (2 mL), charged with triethylsilane (0.02 mL, 0.125 mmol), and stirred at room temperature for 2 h. The reaction mixture was diluted with DMSO (4 mL) and purified by mass-triggered reverse-phase HPLC. Fractions containing pure compound were filtered through a PS—HCO3 cartridge and the filtrate was concentrated in vacuo to give (R)-1-(4-methyl-3-((tetrahydro-2H-pyran-4-yl)oxy)-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea. MS ESI calc'd. For C21H25N5O3 [M+1]+ 396. found 396. 1H NMR (500 MHz, DMSO-d6) δ 8.96 (s, 1H), 8.12 (br s, 1H), 7.33 (m, 4H), 7.22 (m, 1H), 7.16 (br s, 1H), 4.95 (m, 1H), 4.84 (quintuplet, J=7.1 Hz, 1H), 3.84 (m, 2H), 3.52 (m, 2H), 2.59 (s, 3H), 2.06 (m, 1H), 1.71 (m, 1H), 1.39 (d, J=7.1 Hz, 3H).

Source