Synthesis and opioid activities of some naltrexone oxime ethers
摘要:
A series of alkyl, cycloalkyl, aryl, and aralkyl ethers of naltrexone oxime was prepared. The compounds were examined in binding assays for mu, delta and kappa opioid receptor affinity. In addition, the naltrexone oxime ethers were studied in animal models that measure opioid agonist and antagonist activity. These studies led to the discovery of several compounds, notably phenethyl 3e and phenylpropyl 3f ethers of naltrexone, which have a 10-fold increase in potency at the kappa opioid receptor with potent mu and kappa agonist properties in vivo.
Silylative reduction of nitriles was studied under transition metal-free conditions by using B(C6F5)3 as a catalyst with hydrosilanes as a reductant. Alkyl and (hetero)aryl nitriles were efficiently converted to primaryamines or imines under mild conditions. The choice of silanes was found to determine the selectivity: while a full reduction of nitriles was highly facile, the use of sterically bulky
在无过渡金属的条件下,通过使用B(C 6 F 5)3作为催化剂,以氢硅烷作为还原剂,研究了腈的甲硅烷基化还原反应。在温和的条件下,烷基和(杂)芳基腈被有效地转化为伯胺或亚胺。发现硅烷的选择决定了选择性:虽然腈的完全还原非常容易,但是使用空间大体积的硅烷允许部分还原,从而生成N-甲硅烷基亚胺。
Ligand-Promoted Non-Directed C−H Cyanation of Arenes
作者:Luo-Yan Liu、Kap-Sun Yeung、Jin-Quan Yu
DOI:10.1002/chem.201805772
日期:2019.2.11
article reports the first example of a 2-pyridone accelerated non-directed C-H cyanation with an arene as the limiting reagent. This protocol is compatible with a broad scope of arenes, including advanced intermediates, drug molecules, and natural products. A kinetic isotope experiment (kH /kD =4.40) indicates that the C-H bond cleavage is the rate-limiting step. Also, the reaction is readily scalable
Direct Synthesis of Substituted Pyrimidines and Quinazolines
作者:Mohammad Movassaghi、Matthew Hill
DOI:10.1055/s-2007-990932
日期:2008.3
A variety of N-vinyl and N-aryl amides were converted in one step into the corresponding pyrimidine and quinazoline derivatives, respectively. Amide activation with trifluoromethanesulfonic anhydride in the presence of 2-chloropyridine followed by nitrile addition to the activated amide derivative and annulation provides the desired azaheterocycles.
of silyldibromomethyllithium with aryl nitriles provides alpha-keto acylsilanes in good yields. Interestingly, silyldichloromethyllithium induces aza-1,3-Brook rearrangement of the silylgroup in th reaction with nitriles. The rearrangement enables a three-component coupling reaction in a one-pot operation.
New Strategies for the Synthesis of Pyrimidine Derivatives
作者:Matthew D. Hill、Mohammad Movassaghi
DOI:10.1002/chem.200800014
日期:2008.8.8
Recent advances in pyrimidinesynthesis are described. Modification of conventional strategies involving N-C-N fragment condensation with 1,3-dicarbonyl derivatives remains a common theme in current literature. Other methods, including N-C fragment condensation strategies, provide reactive intermediates capable of intramolecular cyclization and formation of pyrimidinederivatives. These recently developed