Enantioselective Synthesis of Piperidine, Indolizidine, and Quinolizidine Alkaloids from a Phenylglycinol-Derived δ-Lactam
作者:Mercedes Amat、Núria Llor、José Hidalgo、Carmen Escolano、Joan Bosch
DOI:10.1021/jo0266083
日期:2003.3.1
Starting from a common lactam, (3R,8aS)-5-oxo-3-phenyl-2,3,6,7,8,8a-hexahydro-5H-oxazolo[3,2-a]pyridine (1), or its enantiomer, the enantioselective synthesis of 2-alkylpiperidines and cis- and trans-2,6-dialkylpiperidines is reported. The potential of this approach is illustrated by the synthesis of the piperidine alkaloids (R)-coniine, (2R,6S)-dihydropinidine, (2R,6R)-lupetidine, and (2R,6R)-solenopsin
(3R,8aS)-5-oxo-3-phenyl-2,3,6,7,8,8,8a-hexahydro-5H-oxazolo [3,2-a] pyrididine(1)从常见的内酰胺开始据报道,其对映体是2-烷基哌啶与顺式和反式2,6-二烷基哌啶的对映选择性合成。哌啶生物碱(R)-芥氨酸,(2R,6S)-二氢吡啶,(2R,6R)-卢哌啶和(2R,6R)-solenopsin A,吲哚并立啶生物碱( 5R,8aR)-吲哚并立定167B和(3R,5S,8aS)-一mono碱I,和非天然碱(4R,9aS)-4-甲基喹quin啶。