Photocatalytic Stoichiometric Oxidant-Free Synthesis of Linear Unsaturated Ketones from 1,2-Disubstituted Cyclopropanols
作者:Alaksiej L. Hurski、Marharyta V. Laktsevich-Iskryk、Anastasiya V. Krech、Vladimir N. Zhabinskii、Vladimir A. Khripach
DOI:10.1055/s-0040-1706088
日期:2021.3
A one-step catalytic oxidant-free synthesis of unsaturated ketones from 1,2-disubstituted cyclopropanols is reported. Previously for this transformation, only two- and three-step protocols have been developed. The reaction proceeds under irradiation with visible light in the presence of catalytic amounts of both an acridinium photocatalyst and a cobaloxime complex. 2-Aryl-substituted cyclopropanols
据报道,由1,2-二取代的环丙醇可一步催化无氧化剂合成不饱和酮。以前,此转换仅开发了两步和三步协议。该反应在催化量的photo啶光催化剂和钴肟肟络合物的存在下在可见光的照射下进行。2-芳基取代的环丙醇反应生成α,β-不饱和酮,而2-烷基取代的底物的脱氢开环提供α,β-和β,γ-烯酮的混合物。该反应开始于环丙醇被光激发的to啶催化剂单电子氧化为环丙氧基。我们还发现Co(dmgBF 2)2(MeCN)2 在空气气氛下用蓝色LED照射或加热时生成的配合物可用作羟基环丙烷氧化剂。