Water → HCID 86687086, compound

Participants

Reaction Steps

A solution of Intermediate 74a (480 mg, 1.72 mmol), triisopropylsilyl trifluoromethane-sulfonate (0.579 mL, 2.16 mmol) and Et3N (0.361 mL, 2.59 mmol) in dry DCM (5 mL) under N2 was stirred at reflux for 2 h. The mixture was cooled to RT, then Et3N (0.361 mL, 2.59 mmol) and triisopropylsilyl trifluoromethanesulfonate (0.579 mL, 2.16 mmol) were added and the orange solution stirred at reflux for 3 h. To the cooled solution, water (5 mL) was added and the mixture shaken. The aqueous was extracted with DCM (5 mL), then the combined organics passed through a hydrophobic frit and concentrated in vacuo to leave an orange oil. FCC, using 1-3% MeOH in DCM, gave the title compound as a pale yellow solid (592 mg, 79%). LCMS (Method 3): Rt 5.66 min, m/z 435 [MH+].

Provenance & Evidence