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At - 78°C the reaction is very slow, while at room temperature a significant reduction in ee is found
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2, respectively. The furan containing α-amino acid derivatives 3h can be used for the synthesis of e. g. aza sugars, see ref. [18]. (matrix presented)
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All the models have been studied by using the MacSpartan software. The structures of intermediates has been optimized and evaluated for approach of the diene. For intermediate 11 there are two different coordination modes of the N-tosyl α-imino ester 1a relative to the phosphino-oxazoline (S)-5d ligand and both have been examined
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All the models have been studied by using the MacSpartan software. The structures of intermediates has been optimized and evaluated for approach of the diene. For intermediate 11 there are two different coordination modes of the N-tosyl α-imino ester 1a relative to the phosphino-oxazoline (S)-5d ligand and both have been examined.
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