General Route to 2,4,5-Trisubstituted Piperidines from Enantiopure β-Amino Esters. Total Synthesis of Pseudodistomin B Triacetate and Pseudodistomin F
作者:Dawei Ma、Haiying Sun
DOI:10.1021/jo000447q
日期:2000.9.1
The Michael addition reaction of enantiopure beta-amino esters with methyl acrylate followed by Dieckmann condensation and enol silylation affords the enol ethers 6, which are hydrogenated with catalysis by Raney-Ni at 80 atm and 80 degrees C to provide 2,4, 5-trisubstituted piperidines with high diastereoselectivity. In this case Ni-H attacks the C-C double bond from the direction of the 2-alkyl group
Total synthesis of pseudodistomin C, a sphingosine-related piperidine alkaloid from tunicate Pseudodistoma kanoko
作者:Yukiko Doi、Masami Ishibashi、Jun'ichi Kobayashi
DOI:10.1016/0040-4020(96)00137-8
日期:1996.3
Pseudodistomin C (1), a piperidine alkaloid isolated from the OkinawantunicatePseudodistomakanoko, has been synthesized from d-serine to provide a further unambiguous evidence for the whole structure of 1 which possessed the opposite absolute configurations at the C-4 and C-5 chiral centers from those of pseudodistomins A (2) and B (3) obtained from the same tunicate.