Synthesis of 2-H-1,2-Oxaphosphorin 2-Oxides via Ag2CO3-Catalyzed Cyclization of (Z)-2-Alken-4-ynylphosphonic Monoesters.
β Scribed by Ai-Yun Peng; Yi-Xiang Ding
- Publisher
- John Wiley and Sons
- Year
- 2005
- Weight
- 15 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0931-7597
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We describe a synthesis of 2E-pyrrole l-oxides (3) from the 3-bromopyrroline l-oxides (2). Bromination in the 3-position of 1-pyrroline l-oxides appears to be a general reaction and the 2-cyano-1-pyrroline l-oxides (1) undergo reaction with E-bromosuccinimide (NBS) to form the monobromo nitrones (2)