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Yb(OTf)3-Catalyzed [4 + 2] Cycloaddition of Allenyltrimethylsilylthioketenes with Arylaldimines.

✍ Scribed by Shigenobu Aoyagi; Satoru Ohata; Kazuaki Shimada; Yuji Takikawa

Publisher
John Wiley and Sons
Year
2007
Weight
32 KB
Volume
38
Category
Article
ISSN
0931-7597

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✦ Synopsis

Abstract

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## Abstract 1,3‐Dipolar cycloaddition of nitrones with ethyl vinyl ether or 2,3‐dihydrofuran proceeds smoothly in the presence of a catalytic amount (10 mol%) of ytterbium triflate to afford isoxazolidines and dicyclic isoxazolidine respectively with good yields and high stereoselectivity.