A convenient palladium catalyzed synthesis of symmetric biaryls, biheterocycles and biaryl chiral diamides
作者:Shyamaprosad Goswami、Avijit Kumar Adak、Reshmi Mukherjee、Subrata Jana、Swapan Dey、John F. Gallagher
DOI:10.1016/j.tet.2005.02.019
日期:2005.4
A series of symmetrical diamido biaryls has been synthesized in good yield by direct homocoupling of iodoarylbenzamides by palladium-catalysis. No cross product has been isolated from the reaction mixture of two different iodoarylbenzamides under similar conditions. However, only in the case of 2-iodo-N-phenylbenzamide, the intramolecularly coupled product phenanthridone has been isolated as a minor
A base-free copper-assisted synthesis of <i>C</i><sub>2</sub>-symmetric spirotelluranes and biaryls based on divergent stoichiometry of Na<sub>2</sub>Te
methodology has been developed for the preparation of biologically important C2-symmetric spirodiaza, benzyloxy and benzoxytelluranes from 2-bromo-N-aryl benzamides, benzyl alcohols, and benzoic acids by using the tellurium dianion (Te2−) under base-free conditions. Furthermore, C–C coupled biaryl 1,1′-diamides have been prepared by using an excess of Na2Te under the same reaction conditions. The synthesized
已经开发了一种一锅法 Cu( I ) 辅助合成方法,用于通过使用碲双阴离子从 2-溴-N-芳基苯甲酰胺、苯甲醇和苯甲酸制备具有生物学重要意义的C 2 -对称螺二氮杂、苯甲氧基和苯甲氧基碲烷。 (Te 2- ) 在无碱条件下。此外,在相同的反应条件下,通过使用过量的 Na 2 Te 制备了 C-C 偶联联芳基 1,1'-二酰胺。合成的螺二氮杂碲烷可作为还原 H 2 O 2和硝基-迈克尔反应的有效催化剂。
Pd/C-Catalyzed Homocoupling Reaction for the Synthesis of
Symmetrical Biaryl Diamides
Pd/C was found to be an efficient and convenient metal catalyst in the homocoupling reaction for the synthesis of symmetrical biaryl diamides. The catalyst systemPd/C–KOAc showed high catalytic activity, and a variety of symmetrical biaryl diamides were conveniently synthesized from 2-halo- N -phenylbenzamides in moderate to good yields.