Dichloromethane → HCID 58312971、化合物

A 25 mL round bottomed flask was charged with methyl 2-chloro-6-(2-methoxyethoxy)pyrimidine-4-carboxylate [SAD105-047F1] (45 mg, 1 equiv.) and CH2Cl2 (1 mL). 1 M DIBAL-H (0.2 mL, 1.1 equiv.) was added at −78° C. over 2 min under argon. The reaction mixture was stirred for 3 h at −78° C. but the LC-MS still showed a lot of starting material. Additional 1 M DIBAL-H (0.27 mL, 1.4 equiv.) was added at −78° C. over 2 min under argon and after 0.5 h LC-MS showed no more starting material but mostly 1 peak at 1.20 min (M+1=217, M+l+MeOH=249). The reaction mixture was quenched with MeOH (0.5 mL) and then with 10% NH4Cl (1 mL). The reaction mixture was warmed to RT and then the solvent was concentrated under reduced pressure. The residue was diluted with 10% NH4Cl (4 mL). The aqueous layer was extracted with EtOAc (3×10 mL). The combined organic layer was dried over Na2SO4 and concentrated under reduced pressure to provide 41.9 mg of the crude 2-chloro-6-(2-methoxyethoxy)pyrimidine-4-carbaldehyde as a yellow oil which was used in the next step without further purification, (H NMR δ: 9.91 (s, 1H); 7.23 (s, 1H); 4.59-4.64 (m, 2H), 3.7-3.8 (m, 2H); 3.44 (s, 3H).