1,1'-Carbonyldiimidazole → HCID 19080431, compound

Participants

Reaction Conditions

Reaction Steps

To the product of Step A (57.2 mg, 0.154 mmol) in dry THF (0.75 mL) was added CDI (76.0 mg, 0.469 mmol) and the reaction heated to 50° C. for 2.5 hr. To this solution was added a solution of p-t-butylphenyl-sulfonamide (131.7 mg, 0.618 mmol) and DBU (92.1 μL, 0.594 mmol) in dry THF (0.75 mL). The reaction continued to be stirred at 50° C. monitoring by thin layer chromatography until all of the mono-acid was consumed (approx. 3 hr). The reaction was concentrated in vacuo and the residue was taken up in 50:50/Et2O:EtOAc. The organic phase was washed with 10% citric acid (2×), water and brine then dried over MgSO4, filtered and the solvent removed. Purification was accomplished by radial chromatography eluting with 3:2/Hex:EtOAc. Yield=74.3 mg (0.131 mmol, 85%) rf=0.32 (80:10:1/CHCl3 :MeOH:NH4OH) FAB mass spectrum, m/e 590.0 (M+Na calculated for C30H33 NSO8 590). See Drummond, J. T.; Johnson, G. Tetrahedron Lett., 1988, 29, 1653.

Provenance & Evidence