Reductive Removal of Phenylseleno Groups from α-Phenylseleno Carbonyl Compounds by Means of Tellurolate Anions
摘要:
Alpha-phenylseleno carbonyl compounds are reduced to the corresponding selenium free carbonyl compounds by reaction with organic and inorganic tellurolate anions.
据报道,一种易于获得的有机-无机杂化催化剂用于α-卤代羰基化合物的还原断裂。稳健的杂化催化剂是 ZnCl 2 Lewis 酸和吖啶橙作为光活性有机染料的自稳定组合。已经使用光物理和电化学实验详细研究了这种混合催化剂的机械特性。一项系统的研究使我们能够发现合适的路易斯酸以有效地稳定α-卤代羰基化合物,从而降低标准有机染料范围内的还原电位。该策略通过引导光氧化还原循环通过氧化猝灭途径解决了脱卤氢化或烷基自由基同源偶联等问题。光活性有机染料和路易斯酸对应物之间的协同作用通过有效和受控地生成烷基自由基,使功能化与广泛的偶联伙伴成为可能,并作为昂贵的后过渡金属基光催化剂的合适替代品。为了证明这种协同催化体系的应用潜力,研究了四种不同的α-羰基溴的合成转化,具有广泛的底物范围。
The photolysis of methyl alpha-(phenylseleno)acetate (1b) and related compounds in the presence of an alkene and CO leads to acyl selenides 2 via group transfer carbonylation. The mechanism of this three-component coupling reaction involves the addition of a (methoxycarbonyl)methyl radical to an alkene, the trapping of the produced alkyl free radical by CO, and termination of the reaction by a phenylselenenyl
Electrolytic partial fluorination of organic compounds. 3. Regioselective anodic monofluorination of organoselenium compounds and their synthetic application
Regioselectiveanodic α-monofluorination of selenides bearing electron-withdrawing groups such as cyano, ester, and amide groups was successfully performed. Highly stereoselective synthesis of α-fluoro α,β-unsaturated esters was achieved by using an α-fluoro α-selenoester prepared.
Radical addition of diethyl (2-phenylseleno)propanedioate to olefins
作者:Jeffrey H. Byers、Gregory C. Lane
DOI:10.1016/s0040-4039(00)97935-8
日期:1990.1
The diethyl malonyl radical can be generated via the photolysis of diethyl (2-phenylseleno)propanedioate. This radical, in turn adds to olefins, and the radical chain process is propagated by phenyl selenide transfer, leading to products arising from formal addition of diethyl (2-phenylseleno)propanedioate.
Tandem homolytic addition/substitution sequences and their application to tin-free radical chemistry
作者:Sofia Lobachevsky、Carl H. Schiesser、Vijay Gupta
DOI:10.1016/j.tetlet.2007.10.139
日期:2007.12
selenides (3a, b, e and f), pent-4-enylseleno benzoate (3c) and phenyl (pent-4-enylseleno)formate (3d) act as precursors of alkyl, acyl and oxyacyl radicals by reaction with diethyl 2-phenylselenomalonate (1) under photochemical conditions in a process involving tandem homolytic addition/substitution to afford tetrahydroselenophenes (5, 11) and the corresponding phenylselenides (6).