6-chloro-3-(2-ethoxy-3,4-dioxo-cyclobut-1-enylamino)-2-hydroxy-N-methoxy-N-methyl-benzenesulfonamide → 6-Chloro-2-hydroxy-N-methoxy-N-methyl-3-{2-[(R)-1-((2R,5R)-5-methyl-tetrahydro-furan-2-yl)-propylamino]-3,4-dioxo-cyclobut-1-enylamino}-benzene sulfonamide

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To a stirred suspension of 6-chloro-3-(2-ethoxy-3,4-dioxo-cyclobut-1-enylamino)-2-hydroxy-N-methoxy-N-methyl-benzenesulfonamide (Intermediate A) (7 g, 17.91 mmol) in MeCN (2 ml) and EtOH (1 ml) under N2 at RT was added ((R)-1-((2R,5R)-5-methyl-tetrahydro-furan-2-yl)-propylamine para-toluenesulfonate salt (Intermediate E) (5.67 g, 17.91 mmol) and TEA (0.999 ml, 7.16 mmol) and the reaction mixture was heated at 50° C. for 16 hours. Further TEA was added (2.48 ml, 17.91 mmol) and the reaction was heated at 50° C. for 1 hour then 60° C. for 20 hours. Further TEA (2.48 ml, 17.91 mmol) and Intermediate E (1.13 g, 3.58 mmol) was added and the reaction was heated at 60° C. for 17.5 hours. The reaction mixture was concentrated in vacuo and partitioned between EtOAc and 1M HCl (aq). The aqueous layer was adjusted to pH 5 using 2M NaOH (aq) and extracted using EtOAc. The EtOAc layers were combined and washed with saturated sodium bicarbonate (aq), water and brine. The organic layer was dried (MgSO4) and concentrated in vacuo. The resulting residue was recrystallised from toluene to give a light brown solid; [M+H]+ 488.2. 1H NMR (DMSO) 0.9 (3H, t, CH3), 1.2 (3H, d, CH3), 1.3 (1H, m) 1.6 (3H, m) 1.9 (2H, m) 3.6 (3H, s, CH3), 3.6 (3H, s, CH3), 3.9 (2H, m) 4.0 (1H, m), 7.2 (1H, d), 8.1 (1H, d), 8.2 (1H, d), 9.5 (1H, s), 10.1 (1H, s).

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