Tetrahydrofuran → phosphoric acid dibenzyl ester 3-(1-methyl-1H-indol-3-yl)-4-(1-methyl-6-nitro-1H-indol-3-yl)-2,5-dioxo-2,5-dihydro-pyrrol-1-ylmethyl ester

참여 물질

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반응 단계

To a cool solution (10° C.) of THF containing 0.12 g (0.68 mmole) of diethylazodicarboxylate, 0.20 g (0.46 mmole) of 1-hydroxymethyl-3-(1-methyl-1H-indol-3-yl)-4-(1-methyl-6-nitro-1H-indol-3-yl)-pyrrole-2,5-dione (from Step a above), and 0.40 g (1.43 mmole) of dibenzylphosphate was added dropwise 5 ml of a solution containing 0.128 g (0.49 mmole) of triphenylphosphine. The resulting mixture was stirred for 14 hours at 20° C. All solvent was evaporated and the residue was purified by chromatography using silica gel and eluting with a mixture of EtOAc/Hexanes to afford phosphoric acid dibenzyl ester 3-(1-methyl-1H-indol-3-yl)-4-(1-methyl-6-nitro-1H-indol-3-yl)-2,5-dioxo-2,5-dihydro-pyrrol-1-ylmethyl ester as a brick red solid (mp=105-109° C.).

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