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New Synthesis of (S)-Dimethyl-4,4′-dimethoxy-5,6,5′,6′-dimethenedioxy-biphenyl-2,2′-dicar boxylate by Configuration Transform.

✍ Scribed by Sen-Xiang Cheng; Jun-Biao Chang; Ling-Bo Qu; Rong-Feng Chen


Publisher
John Wiley and Sons
Year
2004
Weight
146 KB
Volume
35
Category
Article
ISSN
0931-7597

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✦ Synopsis


Abstract

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The nitrosation of some y,&unsaturated B-diketo compounds affords the 3-substituted 4-oxo-5,6-dihydro-1,2,4ff-oxaxines. These compounds are converted to the isomeric 3-oxo-1-pyrroline l-oxides by a facile thermal rearrangement. In connection with our study of y,s-unsaturated 6-ketoesters1'2, we have