A stereospecific route to (Z)-urocanic acids.

[摘要]：(Z)-Urocanic acid (I) and its derivs. can be made stereospecifically by ring-opening of pyrrolo[1,2-c]imidazol-5-ones II [R1 = R2 = H; R1 = Me, R2 = H, Ph] in aq. THF.

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