Potassium Carbonate → 4-{2-[methyl(2-methyl-2-(methyldisulphanyl)propyl)amino]ethoxy}-2,6-bis[(S)-2-eth-(E)-ylidene-7-methoxy-1,2,3,11a-tetrahydropyrrolo[2,1-c][1,4]benzodiazepin-5-one-8-yloxymethyl]pyridine

Participants

Reaction Steps

19.6 μl of methanesulphonyl chloride are added to a solution, cooled to −25° C., of 22 mg of 4-{2-[methyl(2-methyl-2-(methyldisulphanyl)propyl)amino]ethoxy}-2,6-bis(hydroxymethyl)pyridine and of 53 μl of TEA in 0.5 ml of DCM. After stirring for 30 min, the mixture is hydrolysed and the organic phase is washed with water, then dried over MgSO4 and concentrated under RP. The residue thus obtained (22 mg) is added to a solution of 20 mg of tomaymycin in 0.7 ml of DMF, and also 30 mg of K2CO3 and 12 mg of KI. The mixture is stirred at 30° C. for 2 h and then hydrolysed with 4 ml of water. The resulting precipitate is washed with water, dried under vacuum, then dissolved in DCM, concentrated under RP and purified by flash chromatography on silica (Merck SuperVarioFlash 15 g column, Si60 15-40 μm), using a gradient from 0 to 5% of MeOH in DCM. The fractions comprising the desired product are combined and concentrated under RP. 8 mg of 4-{2-[methyl(2-methyl-2-(methyldisulphanyl)propyl)amino]ethoxy}-2,6-bis[(S)-2-eth-(E)-ylidene-7-methoxy-1,2,3,11a-tetrahydropyrrolo[2,1-c][1,4]benzodiazepin-5-one-8-yloxymethyl]pyridine are thus obtained. 1H NMR (500 MHz, d-chloroform): 1.28 (s, 6H); 1.76 (d, J=6.4 Hz, 6H); 2.39 (s, 3H); 2.43 (s, 3H); 2.60 (s, 2H); 2.91 (s, 2H); 2.97 (s, 4H); 3.91 (d, J=4.2 Hz, 2H); 4.00 (s, 6H); 4.09 (s, 2H); 4.27 (s, 4H); 5.27 (s, 4H); 5.61 (q, J=6.4 Hz, 2H); 6.85 (s, 2H); 7.00 (s, 2H); 7.56 (s, 2H); 7.65 (d, J=4.2 Hz, 2H). LC/MS (A): rt=0.74 min; [M+H]+: m/z 855; [M−H]−: m/z 853.

Provenance & Evidence