Journal
ORGANIC LETTERS
Volume 6, Issue 10, Pages 1677-1679Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol049460d
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Trisoxazoline 1/Co(ClO4)(2).6H(2)O catalyzed the 1,3-cycloaddition between nitrones 3 with alkylidene malonates 2 at 0 degreesC to give the isoxazolidines with both high enantioselectivity and high exo selectivity. However, when the temperature was lowered from 0 to 40 degreesC, the same cycloaddition afforded endo isomers as the major products with good to high enantioselectivity. A mechanism is provided.
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