We herein report the synthesis of a bis-2-pyridylidene palladium(II) complex as an isoelectronic structure of the well-known 2,2'-bipyridine complexes. One-pot or stepwise C-Cl oxidative addition followed by base-mediated C-H palladation of the chlorobipyridine dication to palladium(0) yielded the bis-2-pyridylidene palladium(II) carbonate smoothly.
Pyridine derivatives, process for their preparation and composition containing them
申请人:STERLING DRUG INC.
公开号:EP0109027A1
公开(公告)日:1984-05-23
2-(R,O)-3-Q-5-PY-6-R-pyridine (I) or pharmaceutically acceptable acid-addition salts thereof are useful cardiotonics, where R, is methyl or ethyl, R is hydrogen or lower-alkyl, PY is 4(or 3)-pyridinyl or 4(or 3)-pyridinyl having one or two lower-alkyl substituents, and Q is hydrogen, chloro or COOR' where R' is lower-alkyl, or 0 is cyano only when R is hydrogen. The preparation of I and their cardiotonic use are shown.
2-(R,O)-3-Q-5-PY-6-R-吡啶(I)或其药学上可接受的酸加成盐是有用的强心剂,其中 R 是甲基或乙基,R 是氢或低级烷基,PY 是 4(或 3)-吡啶基或具有一个或两个低级烷基取代基的 4(或 3)-吡啶基,Q 是氢、氯或 COOR'(其中 R' 是低级烷基),或 0 是氰基(仅当 R 是氢时)。I 的制备方法及其强心剂用途如图所示。
New Synthetic Routes to 3-, 5-, and 6-Aryl-2-chloropyridines
作者:Robert Church、Ronald Trust、J. Donald Albright、Dennis Powell
DOI:10.1021/jo00117a029
日期:1995.6
The efficient synthesis of 3-, 5-, and 6-aryl-2-chloropyridines via the facile preparation of 5-(dimethyamino)aryl-substituted pentadienyl nitriles and cyclization with hydro chloric acid is described. This approach allows for the introduction of other electron-withdrawing substituents on the pyridine ring as well as the preparation of the desired unsubstituted arylpyridines. Some differences in the rates of cyclization of the pentadienyl nitriles as well as the yields of chloropyridines were observed that depended on the position and degree of substitution in the aryl substituent. The arylpentadienyl nitriles 5 and 6 could also be converted directly into the corresponding 2-aminopyridines.