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A new method for the synthesis of cyclopropane with three electron-withdrawing groups

✍ Scribed by Chen Chen; Yao-Zeng Huang; Yanchang Shen


Publisher
Elsevier Science
Year
1988
Tongue
French
Weight
216 KB
Volume
29
Category
Article
ISSN
0040-4039

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Scheme 1. Preferred a-and b-mannopyranoside synthesis. Scheme 2. Mechanistic proposals for preferred b-mannopyranoside formation. TB ΒΌ TwistΒ± Boat conformation, H ΒΌ half-chair conformation. 2973 Scheme 3. Synthesis of 4 from 1; a) BnSO 2 Cl, pyr (91 %); b) CAN, MeCN/H 2 O (4:1), O 8C (82 %); c) CCl