4-Methylmorpholine → HCID 86654197, compound

Participants

Reaction Steps

A mixture of (1R,10R,11S,16S)-5-hydroxy-1,11,15,15-tetramethyl-8,8-dioxo-8λ6-thiatetracyclo[8.8.0.02,7.011,16]octadeca-2,4,6-triene-3-carboxyl ic acid (65) (0.20 g, 0.49 mmol), HATU (0.37 g, 0.98 mmol), N-methyl morpholine (0.1 mL, 1.5 mmol) and 1-Boc-piperazine (0.27 g, 1.5 mmol) in THF (10 mL) and DMF (2.0 mL) was stirred at room temperature for 18 h. The THF was evaporated under reduced pressure, the residue was quenched with water and the resulting solid was collected by filtration. The crude product was purified by flash column chromatography on silica gel (CH2Cl2/MeOH, 10:1) to give tert-butyl 4-{[(1R,10R,11S,16S)-5-hydroxy-1,11,15,15-tetramethyl-8,8-dioxo-8λ6-thiatetracyclo[8.8.0.02,7.011,16]octadeca-2,4,6-trien-3-yl]carbonyl}piperazine-1-carboxylate (99) (0.13 g, 46%) as a white solid.

Provenance & Evidence