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LaRt man Acetylendicarbonsaure-dimethylester in niedriger Stationarkonzentration mit lsochinolin in Gegenwart von Phenylisocyanat, Mesoxalslure-diathylester oder Azodicarbonsaureester reagieren, gelangt man zu I : 1 : 1-Cycloaddukten der drei Komponenten

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BOOK REVIEWS 2095We have also studied the iodination of several nucleoside derivatives with "diiodotriphenylphosphorane" prepared in situ by the reaction of triphenylphosphine and iodine." While this reagent appears to be somewhat less reactive than I i t was, however, used successfully for the preparation of IIb in 59% yield and of IVe in 50% yield.Details of these and other studies on the iodination of nucleosides will be presented at a later date.(11) G . A. Wiley, R . L. Hershkowitz, B. M. Rein, and B. C. Chung, J . A m Chem. Soc., 86, 964 (1964).