Dicyclohexylcarbodiimide → benzotriazol-1-yl (2Z)-2-methoxyimino-2-[2-(tritylamino)-1,3-thiazol-4-yl]acetate

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To a solution of 2-(2-tritylaminothiazol-4-yl)-(Z)-2-methoxyiminoacetic acid (2.22 g, 5 mmol) and 1-hydroxybenzotriazole (0.74 g, 5.5 mmol) in tetrahydrofuran (22 ml) was added N,N'-dicyclohexylcarbodiimide (1.14 g, 5.5 mmol) at 5°-10° C. and the mixture was stirred at the same temperature for 3 hours. Precipitated N,N'-dicyclohexylurea was removed by filtration and the filtrate was concentrated under reduced pressure. The residue was dissolved in chloroform (20 ml) and insoluble material was removed by filtration. The chloroform was evaporated and the residue was treated with a small quantity of ether to give colorless needles of 1-benzotriazolyl 2-(2-tritylaminothiazol-4-yl)-(Z)-2-methoxyiminoacetate (2.60 g, 93%), mp 178°-179° C. (decomposition).

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