The first 1,3-boronate rearrangement to ketones is reported. The reaction is driven by visible light irradiation, leading to various β-keto tertiary alcohols under metal-free conditions. The excited state overcomes the energy barrier for the rearrangement, and mechanistic studies have excluded a free-radical reaction pathway.
POPIK, V. V.;NIKOLAEV, V. A., ZH. ORGAN. XIMII, 25,(1989) N, S. 1810-1811
作者:POPIK, V. V.、NIKOLAEV, V. A.
DOI:——
日期:——
An Improved Synthesis of 2-Diazo-1,3-diketones
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.