反应详情

温度

-78 °C

A solution of 7-bromo-2-chloro-5-trityl-5H-pyrrolo[3,2-d]pyrimidine (2.00 g, 3.2 mmol) in THF (20 mL) was added a 2.5 N solution of BuLi in hexane (2.82 mL, 7.04 mmol) at −78° C. Then 4-((tert-butyldimethylsilyl)oxy)cyclohexanone (1.2 mL) was added after 15 min. The reaction was stirred at −78° C. for 3 hour, quenched with brine and extracted with EtOAc (3×). The combined organic layer was dried (MgSO4), filtered and concentrated. The residue was purified by ISCO to provide the desired product (1.52 g, 76%). 1H NMR (400 MHz, CDCl3, two isomers) δ 7.64-7.56 (m, 1H), 7.44-7.41 (m, 1H), 7.35-7.31 (m, 9H), 7.16-7.10 (m, 6H), 3.73-3.68 (m, 1H), 2.55-2.51 (m, 1H), 2.42-2.30 (m, 1H), 2.28-2.19 (m, 1H), 2.07-1.94 (m, 2H), 1.91-1.82 (m, 2H), 1.76-1.62 (m, 2H), 0.82 (s, 9H), 0.01 (s, 6H).

1. customquenched with brine
2. extractionextracted with EtOAc (3×)
3. dry with materialThe combined organic layer was dried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified by ISCO