(S)-N-[6-(tert-butyldimethylsilyloxy)hex-1-en-3-yl]-2,2,2-trichloroacetamide

(R)-N-[6-(tert-butyldimethylsilyloxy)hex-1-en-3-yl]-2,2,2-trichloroacetamide

tert-butyl ((S)-1-{[(R)-6-(tert-butyldimethylsilyloxy)hex-1-en-3-yl]amino}-1-oxobut-3-en-2-yl)carbamate

tert-butyl {(3R,6S)-6-[3-(tert-butyldimethylsilyloxy)propyl]-2-oxo-3,6-dihydro-pyridin-3-yl}carbamate