Photoredox-catalyzed decarboxylative alkylation/cyclization of alkynylphosphine oxides: a metal- and oxidant-free method for accessing benzo[<i>b</i>]phosphole oxides
By photoredox-catalysis, alkylation/aryl cyclization of alkynylphosphine oxides towards benzo[b]phospholes has been realized under metal- and oxidant-free conditions at room temperature.
通过光氧化催化,在室温无金属和氧化剂条件下,实现了炔膦氧化物向苯并[b]膦的烷基化/芳基环化。
Catalyst- and Oxidant-Free Desulfonative C−P Couplings for the Synthesis of Phosphine Oxides and Phosphonates
towards phosphineoxides and phosphonates has been successfully developed through the desulfonative coupling of various sulfones with secondary phosphineoxides and phosphites. This protocol features simple experimental procedures under mild conditions (i. e., catalyst‐ and oxidant‐free, room temperature and open to air). By doing so, a variety of alkynyl, alkenyl and allyl phosphineoxides or phosphonates
The first simple and efficient Cu-catalyzed radical addition/cyclization of various unactivated cycloalkanes with diaryl(arylethynyl)-phosphine oxides has been developed, providing a general, one-step approach to construct a new class of important benzo[b]phosphole oxides via sequential C–H functionalization along with two new C–C bond formations.
第一个简单并用二芳基(芳基乙炔) -膦氧化物各种未活化的环烷烃的高效铜催化的自由基加/环化已被开发出来,提供一种一般的,一步式的方法来构造一个新的类重要的苯并[ b ]磷杂环氧化物通过连续的C–H功能化以及两个新的C–C键形成。
Visible-Light-Induced Oxidative C–H Functionalization of Unreactive Cycloalkanes, Alcohols, and Ethers with Alkynylphosphine Oxides into Benzo[<i>b</i>]phosphole Oxides under Photocatalyst-, Metal-, and Base-Free Conditions
作者:Baffa Haruna、Weitu Hong、Warsame Ibrahim Mohamed、Jiami Guo、Liyi Ye、Yingwu Yin、Yuxing Gao、Song Tu
DOI:10.1021/acs.joc.1c00841
日期:2021.9.17
We developed the radical cyclization/addition of alkynylphosphine oxides with easily available cycloalkanes, alcohols, and ethers using a visible-light and environmentally friendly synthetic strategy in the absence of photocatalyst at room temperature. This mild and metal- and base-free reaction provided a structurally varied set of significant benzo[b]phosphole oxides through sequential C–H functionalization
我们在室温下,在没有光催化剂的情况下,使用可见光和环境友好的合成策略,开发了炔基氧化膦与容易获得的环烷烃、醇和醚的自由基环化/加成。这种温和且无金属和碱的反应通过以原子经济的方式连续 C-H 官能化提供了一组结构变化的重要苯并[ b ]磷氧化物。
Palladium-catalyzed dehydrogenative coupling of terminal alkynes with secondary phosphine oxides
作者:Jia Yang、Tieqiao Chen、Yongbo Zhou、Shuangfeng Yin、Li-Biao Han
DOI:10.1039/c4cc09567g
日期:——
The dehydrogenative coupling of terminal alkynes with secondary phosphine oxides is developed. In the presence of a silver additive, palladium acetate could efficiently catalyze the dehydrocoupling of secondary phosphine oxides with a variety of terminal alkynes to produce the corresponding alkynylphosphine oxides in high yields. A reaction mechanism is proposed.