反应详情

To 9 (20 mg) in THF/CH3OH (2 mL) was added a lithium hydroxide solution (1 mL of a 0.1 M solution). The reaction mixture was stirred at an ambient temperature. At 5 hours, LC-MS revealed approximately a 30% conversion to desired product with significant decomposition. The reaction mixture was cooled to −80° C. for 16 hours. LC-MS showed a ˜1:1 mixture of 10 and 9. The reaction mixture was neutralized with 0.1N HCl (˜1 mL) and was concentrated to approximately 1 mL. DMSO (1 mL) and CH3CN (1 mL) were added, and the mixture was purified by preparatory reverse-phase HPLC. Product containing fractions were combined, frozen and lyophilized. This resulted in 1.7 mg (9%) of 10 as a yellow film: MS (ES+) m/z 938 [M+H]+.