(2R,αS)-tert-butyl 1-(N-α-methylbenzyl)-2,5-dihydro-1H-2-pyrrolyl-acetate

(E)-6-oxo-hex-2-enoic acid tert-butyl ester

tert-butyl-(3S,αS)-3-(N-benzyl-N-(α-methylbenzyl)amino)-6-hydroxyhexanoate

(E)-tert-butyl penta-2,4-dienoate

(3R,αS)-tert-butyl 3-(N-allyl-N-α-methylbenzylamino)-pent-4-enoate