反应详情

A solution of acid 8b (47.0 mg, 0.125 mmol) and CDI (22.3 mg, 0.150 mmol) in dry DCE (1.0 mL) was stirred at rt for 8 h. The cyclopropyl sulfonamide 9b (18.2 mg, 0.150 mmol) and DBU (22.8 mg, 0.150 mmol) were sequentially added and the mixture stirred at rt for 48 h. The solvent was evaporated and the residue diluted with EtOAc (2 mL). The mixture was washed sequentially with 0.5 M HCl (2×), deionized H2O and brine. The EtOAc solution was dried over MgSO4, filtered through a Celite plug capped with a layer of MgSO4 and concentrated. The crude product was purified via a SiO2 column (CH2Cl2, 25% EtOAc/hexanes then 50% EtOAc/hexanes) to give compound 104 as an ivory solid; 3:2 mixture of diastereomers, 27 mg, 45% (3:2 mixture of diastereomers), MS m/z 478.1 (APCI−, M−1).

1. customThe solvent was evaporated
2. additionthe residue diluted with EtOAc (2 mL)
3. washThe mixture was washed sequentially with 0.5 M HCl (2×)
4. dry with materialThe EtOAc solution was dried over MgSO4
5. filtrationfiltered through a Celite plug
6. customcapped with a layer of MgSO4
7. concentrationconcentrated
8. customThe crude product was purified via a SiO2 column (CH2Cl2, 25% EtOAc/hexanes