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The starting material, 1,4-DHP derivative 4, could be obtained in large scale-up to 20 g in a single preparative step.
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2942583536
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The proximity of a chiral auxiliary to the labile stereocenter in the crystallization process is sometimes no as important. See ref bellow 14.
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See the Supporting Information for the ORTEP drawing of the enantiopures imines (4S,1′R)-6 and (4S,1′R)-6.
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(a) For the X-ray single-crystal structure determination of (4S,2′R,4′R)-9, see the crystallographic characteristics in the Supporting Information (SI1).
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For the X-ray single-crystal structure determination of (4R,2′S)-20, see the crystallographic characteristics in the Supporting Information.
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