반응 #88762

반응 방정식

6-bromo-1-methyl-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione

6-bromo-5-((4-chlorophenyl)(hydroxy)methyl)-1-methyl-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione

Compound 20

6-bromo-5-((4-chlorophenyl)(hydroxy)methyl)-1-methyl-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione

LDA

5-chloropicolinaldehyde

→

6-bromo-5-((5-chloropyridin-2-yl)(hydroxy)methyl)-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione

수율 138.9%

용매

THF

THF

EA

water

반응 조건

후처리

1. 1
   workup.STIRRINGThe reaction was stirred at −78° C. for 40 min
2. 2
   세척The organic layer was washed with brine (30 mL)
3. 3
   건조dried over Na2SO4
4. 4
   농축concentrated to a residue which
5. 5
   기타was purified by chromatography
6. 6
   세척eluted with PE/EA (8:1)

실험 절차

To a solution of 6-bromo-1-methyl-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (See Compound 20, step 4, 398 mg, 0.10 mmol) in THF (10 mL) at −78° C. was added LDA (2M in THF, 2.50 mL, 5.00 mmol) dropwise. The reaction was stirred at −78° C. for 1 h then 5-chloropicolinaldehyde (211 mg, 1.50 mmol) in THF (2 mL) was added. The reaction was stirred at −78° C. for 40 min then diluted with EA (20 mL) and water (10 mL). The organic layer was washed with brine (30 mL), dried over Na2SO4 and concentrated to a residue which was purified by chromatography eluted with PE/EA (8:1) to give 6-bromo-5-((5-chloropyridin-2-yl)(hydroxy)methyl)-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (75 mg, 13.9% yield) as a solid. LCMS: MH+ 541 and TR=1.773 min.

출처