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ChemInform Abstract: Synthesis of (.+-.)-Diospongin A: A Hetero-Diels—Alder and C-Glycosylation Approach.

✍ Scribed by Jesse D. More

Publisher
John Wiley and Sons
Year
2010
Weight
26 KB
Volume
41
Category
Article
ISSN
0931-7597

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✍ E. CEULEMANS; M. VOETS; S. EMMERS; W. DEHAEN 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 34 KB 👁 2 views

The pyrazole aldehyde (I) undergoes Knoevenagel condensations with heterocycles to yield adducts, which are directly thermolyzed to cyclize via hetero Diels-Alder reactions to cis-fused tetracyclic title heterocycles. Interestingly, the isoxazolo-fused cycloadduct (VII) is converted to the spiro-azi