还原性烯烃交叉偶联代表了从现成的烯烃原料构建 C-C 键的直接策略。已经开发出一种利用草酸作为无痕关键的一锅法来实现缺电子烯烃的直接交叉偶联。整个过程是一个两步转化,涉及加氢羧化,然后是脱羧交叉偶联。双光催化剂系统对于成功至关重要,并协同促进两个反应步骤。该反应支持生物活性分子的有效合成。光氧化还原催化为 CO 2的生成提供了一种简单而温和的途径从草酸中分离出自由基阴离子,这为这种活性中间体在精细化学品合成中的广泛应用铺平了道路。
Enantioselective Hydrophosphination of Terminal Alkenyl Aza‐Heteroarenes
作者:Esther G. Sinnema、Tizian‐Frank Ramspoth、Reinder H. Bouma、Luo Ge、Syuzanna R. Harutyunyan
DOI:10.1002/anie.202316785
日期:2024.2.12
Stereoselective hydrophosphination of alkenes is a promising route to chiral phosphorus compounds, but the use of alkenyl-heteroarenes is challenged by their low reactivity and control of stereoselectivity. Here we present a general Mn(I)-catalysed enantioselective hydrophosphination of alkenyl aza-heteroarenes. The method was applied to a wide range of alkenyl heterocycles and provided access to a
The direct reductive functionalization of alkynes undermildconditions presents a promising yet challenging avenue for accessing value-added molecules. Alkyne radical anions represent a distinct class of reactive intermediates characterized by both a charge and an unpaired electron, thus holding great potential for facilitating diverse bond formations, particularly in alkyne reductive functionalization
The direct alpha-methylenation of benzylpyridines was achieved using N,N-dimethylacetamide (DMA) as a one-carbon source under copper catalysis. An intermediary species was detected at an early stage, and a possible mechanism was proposed. Additionally, alpha-oxygenation and dimerization of benzylpyridines could also be performed efficiently.