作者:V. V. Popic、S. M. Korneev、V. A. Nikolaev、I. K. Korobitsyna
DOI:10.1055/s-1991-26416
日期:——
The sodium hydride/dibenzo-18-crown-6 ether system was found to be an effective base for the synthesis of 1,3-diketones by the Claisen condensation. The use of potassium fluoride (with or without crown ether) as the base in diazo-transfer reactions extends this reaction to the synthesis of hindered diazo diketones. In the case of isomeric 1,3-diketones, the stereoselectivity of the process considerably rises.
氢化钠/二苯并-18-冠-6醚体系被发现是通过克莱森缩合合成1,3-二酮的有效碱。使用氟化钾(有或没有冠醚)作为二氮转移反应中的碱,将该反应扩展到合成受阻的二氮二酮。在异构体1,3-二酮的情况下,反应的立体选择性显著提高。