Volume 22, Issue 9 pp. 945-949
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Synthesis of 5-fluoroalkyl lsoxazolidines via 1,3-dipolar cycloaddition of ethyl 2-hydropolyfluoroalk-2-enoates with nitrones

Jin-Tao Liu

Corresponding Author

Jin-Tao Liu

Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

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Qi-Hui Jin

Qi-Hui Jin

Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

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He-Jun Lü

He-Jun Lü

Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

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Wei-Yuan Huang

Wei-Yuan Huang

Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

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First published: 26 August 2010
Citations: 3

Dedicated to Professor Chengye Yuan on the occasion of his 80th birthday.

Abstract

1,3-Dipolar cycloaddition reactions of ethyl 2-hydropolyfluoroalk-2-enoates (1) with some nitrones were described. The reaction of 3,4-dihydroisoquinoline N-oxide (2) with 1 took place readily in methylene chloride at room temperature to give the corresponding 5-fluoroalkylisoxazolidines regioselectively as a mixture of two diastereoisomers (trans and cis) in high yields, while longer reaction time and higher temperature were needed in the case of non-cyclic nitrones. Under similar conditions the reaction of quinoline N-oxide (14) with 1 did not give the expected adducts and a ring-opening product was obtained.

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