Diisopropylethylamine → HCID 86623941, 화합물

참여 물질

반응 단계

To a solution of methyl (2E)-3-(3,4-diaminophenyl)acrylate (from Step 3.1 eq), 1-[(tert-butoxycarbonyl)amino]cyclopentanecarboxylic acid (1 eq) in DMF (0.02 M), HATU (1 eq) and DIPEA (3 eq) were added. The reaction mixture was left at RT with stirring overnight. The resulting mixture was partitioned between EtOAc and HCl (1 N). The combined EtOAc layers were washed with brine, and the organic phase was dried over Na2SO4, separated, and evaporated in vacuo to afford methyl (2E)-3-{4-[({1-[(tert-butoxycarbonyl)amino]cyclopentyl}carbonyl)amino]phenyl}acrylate, which was used without further purification. MS (ES+) m/z 404 (M+H)+. The foregoing product was dehydrated by heating it at 65° C. in presence of acetic acid. (0.16 M); the reaction residue was purified by RP-HPLC (Conditions Symmetry (Waters) C18 Column, 7 micron, 19×300 mm; flow: 20 mL/min; Gradient: A H2O+0.1% TFA; B: MeCN+0.1% TFA; 70% A isocratic for 2 min., linear to 20% A in 16 min isocratic for 0.5 min. and linear to 10% A for 2 min). Fractions containing pure product were pooled and lyophilized to give methyl (2E)-3-(2-{1-[(tert-butoxycarbonyl)amino]-cyclopentyl}-1H-benzimidazol-5-yl)acrylate. MS (ES−) m/z 384 (M−H)−.

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