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ChemInform Abstract: Applications of Aziridinium Ions: Selective Syntheses of Pyrazolidin-3-ones and Pyrazolo[1,2-a]pyrazoles.

✍ Scribed by Tsung-Hsun Chuang; K. Barry Sharpless

Publisher
John Wiley and Sons
Year
2010
Weight
37 KB
Volume
31
Category
Article
ISSN
0931-7597

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## Abstract A convenient four‐step synthesis of the aminobicyclopyrazolone hydrochloride **1**Β·HC1 was achieved starting from di‐__tert__‐butyl hydrazodiformate **(8)**. The route entails cyclization of **8** with 1,3‐dibromopropane under phase transfer conditions followed by deprotection of 1,2‐di