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Conversion of DHA-piperazine 9 (Coertzen et al., 2018; Wu et al., 2018) into piperazine sulfonamide derivatives 13–19, urea derivatives 20–24, and amide derivatives 25–28. The DHA-piperazine 9 was treated with the electrophile in tetrahydrofuran (THF) in the presence of triethylamine (Et3N) or in dichloromethane at room temperature. Yields are for products isolated by chromatography for reactions conducted on a 2.3 mmol scale with 9.
