Visible light-promoted reactions with diazo compounds: a mild and practical strategy towards free carbene intermediates

Chemical Society Reviews, Год журнала: 2020, Номер 49(19), С. 6833 - 6847

Опубликована: Янв. 1, 2020

Carbenes are important intermediates in organic chemistry and have been widely applied various types of reactions, ranging from cycloaddition reactions sigmatropic rearrangements to C-H functionalizations, thus allowing the rapid construction densely functionalized molecules. Over past decades, remarkable progress has achieved metal-catalyzed carbene transfer reactions. Nevertheless, realizing these transformations under milder and/or greener conditions is still highly desirable. Only recently, visible light-promoted diazo compounds via free emerged as a practical, mild powerful tool. In this tutorial review, we summarize latest advances area, aiming at providing clear overview on reaction design, mechanistic scenarios potential future developments.

Язык: Английский

---

Lightening Diazo Compounds?

ACS Sustainable Chemistry & Engineering, Год журнала: 2021, Номер 9(27), С. 8895 - 8918

Опубликована: Июнь 25, 2021

The development of new sustainable reactions and protocols is essential to fulfill the growing demands every branch organic chemistry for greener synthetic methodologies. In this context, use visible light as only source energy highly appealing. Since diazo compounds are valuable reagents in synthesis, their transformations realized a manner interest. High reactivity easy availability make them suitable solar-driven transformations. Indeed, photochemical have recently proven alternative transition metal catalysis. perspective, we highlight applications these under irradiation, particularly focusing on recent advancements. These include generation carbenes radicals which involve many relevant reactions, [2+1]-cycloadditions, X–H C–H insertions, Wolff rearrangement, more. Mechanistic aspects processes briefly addressed give readers deeper understanding rules underlying photoreactivity compounds. We conclude by emphasizing significant advancements discussing challenges future developments photochemistry reagents.

Язык: Английский

---

Recent Perspectives on Rearrangement Reactions of Ylides via Carbene Transfer Reactions

Chemistry - A European Journal, Год журнала: 2020, Номер 27(4), С. 1270 - 1281

Опубликована: Авг. 5, 2020

Abstract Among the available methods to increase molecular complexity, sigmatropic rearrangements occupy a distinct position in organic synthesis. Despite being known for over century rearrangement reactions of ylides via carbene transfer reaction have only recently come age. Most ylide mediated processes involve rupture σ‐bond and formation new bond between π‐bond negatively charged atom followed by simultaneous redistribution π‐electrons. This minireview describes advances this research area made recent years, which now opens up metal‐catalyzed enantioselective reactions, metal‐free photochemical novel pathways that can be accessed intermediates.

Язык: Английский

---

Unlocking novel reaction pathways of diazoalkanes with visible light

Chemical Communications, Год журнала: 2022, Номер 58(17), С. 2788 - 2798

Опубликована: Янв. 1, 2022

In this feature article, the photolysis and dye-sensitized reactions of diazoalkanes are discussed applications in organic synthesis presented.

Язык: Английский

---

Visible Light-Induced Reactions of Diazo Compounds and Their Precursors

Chemical Reviews, Год журнала: 2024, Номер 124(11), С. 7214 - 7261

Опубликована: Май 16, 2024

In recent years, visible light-induced reactions of diazo compounds have attracted increasing attention in organic synthesis, leading to improvement existing reactions, as well the discovery unprecedented transformations. Thus, photochemical or photocatalytic generation both carbenes and radicals provide milder tools toward these key intermediates for many valuable However, vast majority transformations represent new reactivity modes compounds, which are achieved by decomposition photoredox catalysis. particular, use a redox-active photocatalysts opens avenue plethora radical reactions. The application methods led inaccessible classical associated with metal carbenes. most cases, act sources but can also serve acceptors. Importantly, described processes operate under mild, practical conditions. This Review describes this subfield compound chemistry, particularly focusing on advancements.

Язык: Английский

---

A leap forward in sulfonium salt and sulfur ylide chemistry

Chinese Chemical Letters, Год журнала: 2020, Номер 32(1), С. 299 - 312

Опубликована: Июнь 3, 2020

Язык: Английский

---

Light-induced metal-free transformations of unactivated pyridotriazoles

Chemical Science, Год журнала: 2019, Номер 10(36), С. 8399 - 8404

Опубликована: Янв. 1, 2019

A highly efficient and practical method for incorporation of the arylmethylpyridyl moiety into diverse molecules has been developed. This features transition metal-free light-induced room temperature transformation pyridotriazoles pyridyl carbenes, which are capable smooth arylation, X-H insertion, cyclopropanation reactions. The synthetic usefulness developed was illustrated in a facile synthesis biologically active molecules.

Язык: Английский

---

Photochemical ring expansion reactions: synthesis of tetrahydrofuran derivatives and mechanism studies

Chemical Science, Год журнала: 2019, Номер 10(43), С. 10129 - 10134

Опубликована: Янв. 1, 2019

We have shown light mediated ring-expansion reactions of 4-membered ring heterocycles. The reaction proceeds via a diradical mechanism and bond length play key role in the stereodetermining step.

Язык: Английский

---

Norcaradiene Synthesis via Visible-Light-Mediated Cyclopropanation Reactions of Arenes

Organic Letters, Год журнала: 2019, Номер 21(21), С. 8814 - 8818

Опубликована: Окт. 16, 2019

Cyclopropanation reactions of carbenes with arenes provide a straightforward pathway to norcaradienes or cycloheptatrienes. This reaction normally requires harsh conditions transition-metal catalysts. In this report, we describe the metal-free visible-light photolysis aryl diazoacetates in aromatic solvents, which provides access norcaradiene ring system highly regio- and stereoselective manner. The mild approach also allow chemoselective cyclopropanation substituted without competing C-H functionalization reactions.

Язык: Английский

---

Catalyst-Free Organic Transformations under Visible-Light

ACS Sustainable Chemistry & Engineering, Год журнала: 2021, Номер 9(12), С. 4296 - 4323

Опубликована: Март 16, 2021

Pollutants from industry and chemical laboratories have harmful effects on human health the environment. Concerns about this problem led to development of more versatile sustainable protocols based principles green chemistry. One these innovative approaches is carry out reactions under visible-light sources without photocatalysts. This benign, simple, cost-effective method, inspired by nature, could be a suitable alternative some classical methods, change harsh reaction conditions into milder ones. In Perspective, we outlined results catalyst-free organic further encourage researchers in promising field. The proposed mechanisms generation an electron donor–acceptor complex (EDA) single-electron transfer (SET) pathway were discussed.

Язык: Английский

---