Preparation of 2,3-trans-substituted piperidines from optically active β-amino-α-methylene esters: Synthesis of optically active (2S,3R)-(−)-epi-CP-99,994
作者:Akio Kamimura、Ryuichiro Yo、Hidemitsu Uno
DOI:10.1016/j.tet.2017.06.054
日期:2017.8
6-tetrahydropyridine intermediates took place smoothly in the presence of a Pd/C catalyst to give trans-2,3-disubstituted piperidines in good yields and in a highly stereoselective manner. The total synthesis of opticallyactive (2S,3R)-(−)-epi-CP-99,994 was achieved in six-steps from an unsaturated piperidine.
The intramolecularPauson–Khandreaction of aza-Baylis–Hillman adducts, which were prepared through the thio-Michael/imino-aldol domino reaction of optically active sulfinimines, was examined and gave optically active cis- and trans-pyrrolidine-fused cyclopentenones in a stereoselective manner.