Synthesis of 3E-tetradecenol, 3E, 9E-tetradecadienol, and their acetates starting from acetylcyclopropane
摘要:
Stereospecific synthesis of the linear E-olefins mentioned in the title was realized by a general scheme that was worked out earlier by the authors and which includes as key steps homologization of the corresponding aliphatic pentakisnoraldehydes by means of trimethylsilyloxyvinylcyclopropane and ZnBr2-initiated rearrangement of the intermediate cyclopropylcarbinols under the influence of Me3SiBr.
Gibbilimbols A-D (1-4) were synthesized in 32-49% yield over four steps from commercially available starting materials. A copper-catalyzed coupling of 4-methoxyphenylmagnesium bromide with various unsaturated alkyl bromides was the key step in assembling the (long-chain alkyl)phenol skeleton.
Chain-modified pyridino-N substituted nicotine compounds for use in the treatment of CNS pathologies
申请人:——
公开号:US20030225142A1
公开(公告)日:2003-12-04
Compounds for treating abuse of nicotinic receptor agonists, addiction to psychostimulant drugs, addiction to opiates, addiction to alcohol, addiction to tobacco products, addiction to nicotine, schizophrenia and related diseases, depression and related conditions, Alzheimer's disease, Parkinson's disease, irritable bowel syndrome, and colitis. The compounds competitively inhibit central nervous system acting nicotinic receptor agonists and act at the putative &agr;3&bgr;2* and &agr;4&bgr;2 neuronal nicotinic receptors in the central nervous system.
The syn addition of alkylcopper compounds to various alkynes HCC(CH2)2Z (n = 2, 3, Z = X, NEt2, SEt, OR) shows a regio-selectivity dependant on various factors, the major factors being the nature of the function and the solvent. The vinylcopper derivatives thus obtained have been carboxylated, iodinated and alkylated.