Water → (+/-)-5-(2-Methyl-propane-2-sulfinylamino)-2-(6-methyl-2-p-tolyl-imidazo[1,2-a]pyridin-3-yl)-pentanoic acid methyl ester

To a magnetically stirred solution of 2-(6-methyl-2-p-tolyl-imidazo[1,2-a]pyridin-3-yl)-5-oxo-pentanoic acid methyl ester 44a (0.066 g, 0.189 mmol) in THF (2 mL) at room temperature under Ar atmosphere was added 2-methyl-propane-2-sulfinic acid amide (0.023 g, 0.189 mmol) and titanium ethoxide (20 wt % solution in ethanol, 2 mL). The reaction mixture was stirred overnight at room temperature. Water (40 mL) was added, and the aqueous phase was extracted with ethyl acetate (2×40 mL). The combined organic layers were washed with water, dried (MgSO4), and concentrated in vacuo. The reaction mixture was redissolved in MeOH (2 mL) and sodium borohydride (0.014 mg, 0.378 mmol) was added at room temperature. The reaction mixture was stirred for 1 h at room temperature, then water (40 mL) was added, and the aqueous phase was extracted with ethyl acetate (2×100 mL). The combined organic layers were washed with water, dried (MgSO4), and concentrated in vacuo to provide crude product.

1. extractionthe aqueous phase was extracted with ethyl acetate (2×40 mL)
2. washThe combined organic layers were washed with water
3. dry with materialdried (MgSO4)
4. concentrationconcentrated in vacuo
5. dissolutionThe reaction mixture was redissolved in MeOH (2 mL)
6. stirringThe reaction mixture was stirred for 1 h at room temperature
7. extractionthe aqueous phase was extracted with ethyl acetate (2×100 mL)
8. washThe combined organic layers were washed with water
9. dry with materialdried (MgSO4)
10. concentrationconcentrated in vacuo
11. customto provide crude product

ORD record

ord-1f0f7094ad0f49a39acdd7168a078d69

Source dataset

uspto-grants-2009_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07566725B2