A condensation of α,β unsaturated aldehydes with O protected 4 hydroxybutanal N (tert butyl) imine has been exemplified for the first time using (E) cinnamic and (E) 4 methoxycinnamic aldehydes. (E,E) 2,5 Disubstituted penta 2,4 dienals, which are key intermediates in the syn thesis of strobilurins A and X, were prepared in good yields and close to 100% stereoselectivity.
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