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Preparation of the enantiomerically enriched allylic carbonate electrophile. BOC-ON=2-(tert-butoxycarbonyloxyimino)-2-phenylacetonitrile, DCHT=dicyclohexyl tartrate, MS=molecular sieves, TBHP=tert-butyl hydroperoxide, TBS=tert-butyldimethylsilyl.
