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Heavily substituted cyclopropane esters were prepared in high yields, complete diastereoselection and high (up to 96%) enantioselectivity. The reaction described herein entailed reacting 4-nitro-5-styrylisoxazoles, a class of cinnamate synthetic equivalent, with 2-bromomalonate esters under the catalysis of 5 mol% of a Cincona derived phase-transfer catalyst. The reaction allowed multi-gram preparation of desired products.
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