Tandem enlargement of the tetrahydropyridine ring in 1-aryl-tetrahydroisoquinolines using activated alkynes—a new and effective synthesis of benzoazocines
作者:Leonid G. Voskressensky、Tatiana N. Borisova、Anna V. Listratova、Larisa N. Kulikova、Alexander A. Titov、Alexey V. Varlamov
DOI:10.1016/j.tetlet.2006.04.151
日期:2006.7
Tetrahydroisoquinolines 3a–e underwent piperidine ring enlargement under the action of activatedalkynes, giving benzoazocines 4, 5 and 7–11 in high yields.
of various nitrogenheterocycles, including but not limited to quinolines, isoquinolines, indoles and pyridinium salts, in an aqueous solution of HCO2H/HCO2Na under mild conditions. The catalyst shows excellent functional‐group compatibility and high turnover number (up to 7500), with catalyst loadings as low as 0.01 mol % being feasible. Mechanistic investigation of the quinolinereduction suggests
在温和条件下,显示出环金属化的铱络合物在HCO 2 H / HCO 2 Na的水溶液中催化各种氮杂环的转移加氢反应,包括但不限于喹啉,异喹啉,吲哚和吡啶鎓盐。该催化剂表现出出色的官能团相容性和高周转率(最高7500),催化剂用量低至0.01 mol%是可行的。对喹啉还原反应的机理研究表明,转移氢化反应是通过1,2和1,4加成途径进行的,催化转化受氢化物转移步骤的限制。
The present invention is directed to compounds of formula (I) which are M1 receptor positive allosteric modulators and that are useful in the treatment of diseases in which the M1 receptor is involved, such as Alzheimer's disease, schizophrenia, pain or sleep disorders. The invention is also directed to pharmaceutical compositions comprising the compounds, and to the use of the compounds and compositions in the treatment of diseases mediated by the M1 receptor.