Piperidine alkaloid content of Picea pungens (Colorado blue spruce)
摘要:
The content and pattern of piperidine alkaloid accumulation in Picea pungens, the Colorado blue spruce, was studied as a function of growth stage and plant part. Qualitative and quantitative differences were encountered between early seedlings, mature trees, needles, stems and other plant parts. A new natural piperidine imine alkaloid, 2-methyl-6-propyl-1,6-piperideine, was found and postulated to be an intermediate leading to epidihydropinidine, the major alkaloid found in spruce needles.
A chirospecificsynthesis of thecis-2,6-dialkylpieperidine alkaloids1 and2 has been achieved in eight steps (23%) and six steps (32%) from the known iodide3, respectively.
Efficient synthesis of an enantiomeric pair pinpinidine: An illustration of organochemical carving on the rigid bridged system as the stereochemical tactics
Asymmetric synthesis of (−)-pinidine and its enantiomer was accomplished by starting from norgranatar one via the asymmetric enolization, stereoselective cyclopropanation, and oxidative ring cleavage of the resulting cyclopropanol system with a hypervalent iodoid as key steps.
Hypervalent λn-iodane-mediated fragmentation of tertiary cyclopropanol systems II: Application to asymmetric syntheses of piperidine and indolizidine alkaloids
The asymmetric synthesis of (-)-pinidine and its enantiomer was accomplished by starting from norgranatanone via the asymmetric enolization, stereoselective cyclopropanation, and oxidative ring cleavage of the resulting cyclopropanol system with a hypervalent lambda(n)-iodane as key steps. Formal asymmetric synthesis of (+)-indolizidine 223AB was also performed via the asymmetric enolization and oxidative ring cleavage of the resulting cyclopropanol system as key steps. (C) 1999 Elsevier Science Ltd. All rights reserved.
Asymmetric synthesis with .alpha.,.beta.-bis[(methoxymethyl)oxy] ketones. Enantioselective total synthesis of natural (+)-indolizidine 195B (bicyclic gephyrotoxin 195B) and (-)-pinidine and their enantiomers from a common chiral synthon
作者:Naoki Yamazaki、Chihiro Kibayashi
DOI:10.1021/ja00186a038
日期:1989.2
Stereocontrolled Syntheses of Piperidine Derivatives Using Diastereoselective Reactions of Chiral 1,3-Oxazolidines with Grignard Reagents: Asymmetric Syntheses of the Pinidine Enantiomers