Synthesis of Cannabinoid Model Compounds. Part 3. (6aR, 10aR)-N-ethyl-?8-tetrahydrocannabinol-18-amide, (6aR, 10aR, 17RS)-N-ethyl-17-methyl-?8- tetrahydrocannabinol-18-amide and (6aR, 10aR)-17,18-didehydro-?8-tetrahydrocannabinol
The novel cannabinoids (6aR, 10aR)-N-ethyl-Δ8-tetrahydrocannabinol-18-amide (15) and (6aR, 10aR, 17 RS)-N-ethyl-17-methyl-Δ8- tetrahydrocannabinol-18-amide (16), designed as cannabinoid affinity ligands, were synthesized from the corresponding acids 11 and 12via the N-hydroxysuccinimide esters. Amide 16 was tested in the rat and was generalized to Δ9-tetrahydrocannabinol, being 5 times less potent