4-Hydroxylated Piperidines and <i>N</i>-Methyleuphococcinine (1-Methyl-3-granatanone) from <i>Picea</i> (Spruce) Species. Identification and Synthesis

Abstract

Three trace alkaloids from Colorado blue spruce, Picea pungens, were identified by synthesis and GC-MS comparisons as 4alpha-hydroxy-cis-2-methyl-6-(2-oxopropyl)piperidine (1), 4alpha-hydroxy-cis-2-methyl-6-propylpiperidine (11), and 1-methylgranatanone (15) (N-methyl-9-aza-1-methylbicyclo[3.3. 1]nonane or N-methyleuphococcinine). Alkaloids 1 and 11 are the first among numerous known pine and spruce piperidines to contain a ring-oxygenated substituent.