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note
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Studies by us have indicated that the direct stereoselective oxy-Michael addition to αβ-unsaturated esters (such as tertbutyl crotonate) was not a viable way to synthesise protected aldol products owing to the low natural reactivity of the two components.
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27
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note
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All the sulfone-derived Michael acceptors 2 and 5 were obtained as a mixture Z/E isomers with the predominant E configuration assigned by NOE.
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