A concise methodology for the synthesis of (−)-Δ9-tetrahydrocannabinol and (−)-Δ9-tetrahydrocannabivarin metabolites and their regiospecifically deuterated analogs
摘要:
The availability of tetrahydrocannabinols (Delta(9)-THC), tetrahydrocannabivarins (Delta(9)-THCV), and their metabolites in both their undeuterated and deuterated forms is critical for the analysis of biological and toxicological samples. We report here a concise methodology for the syntheses of (-)-Delta(9)-THC and (-)-Delta(9)-THCV metabolites in significantly improved overall yields using commercially available starting materials. Our approach allowed us to obtain the key intermediates (6aR,10aR)-9-nor-9-oxo-hexahydrocannabinols in four steps from (+)-(1R)-nopinone. This was followed by an optimized Shapiro reaction to give the (-)-11-nor-9-carboxy-metabolites, which were converted to their respective (-)-11-hydroxy analogs. The synthetic sequence involves a minimum number of steps, avoids undesirable oxidative conditions, and incorporates the costly deuterated resorcinols near the end of the synthetic sequence. This methodology enabled us to synthesize eight regiospecifically deuterated (-)-Delta(9)-THC and (-)-Delta(9)-THCV metabolites in a preparative scale and high optical purity without deuterium scrambling or loss. (c) 2007 Published by Elsevier Ltd.
Conformationally restricted hybrids of CP-55,940 and HHC: Stereoselective synthesis and activity
作者:Marcus A. Tius、Alexandros Makriyannis、Xiang Long Zoua、V. Abadji
DOI:10.1016/s0040-4020(01)86983-0
日期:1994.2
A stereoselective total synthesis of each of the two diastereomeric C6-hydroxyethyl analogs of (-)-9-nor-9 beta-hydroxyhexahydrocannabinol has been reported. Control of the stereochemistry at C6 during the key step is accomplished through an intramolecular oxymercuration reaction. The prediction that the analogs would exhibit different degrees of binding to the cannabinoid receptor was borne out. This observation sheds light on the stereochemical requirements of the receptor.
TIUS, MARCUS A.;KANNANGARA, G. S. KAMALI, J. ORG. CHEM., 55,(1990) N2, C. 5711-5714