Selective Conversions of CO₂ into Value-Added Chemicals via Cooperative Catalysis Using Multifunctional Catalysts

Bulletin of the Chemical Society of Japan, Год журнала: 2023, Номер 96(7), С. 693 - 701

Опубликована: Июнь 8, 2023

Abstract Carbon dioxide (CO2) is not only a greenhouse gas but also renewable carbon source for organic synthesis. Here we have summarized our studies on the conversions of CO2 into value-added chemicals via cooperative catalysis using multifunctional catalysts. For example, bifunctional metalloporphyrin catalysts with quaternary ammonium halides were developed selective synthesis cyclic carbonates or polycarbonates from epoxides and CO2. Bifunctional MgII ZnII porphyrins showed high catalytic activity carbonates, while AlIII catalyzed copolymerization cyclohexene oxide to give poly(cyclohexene carbonate). The activities resulted action central metal ion salts. Chiral kinetic resolution terminal internal developed. In addition, macrocyclic multinuclear complex Zn5L3, which was synthesized by self-assembly Zn(OAc)2 BINOL derivative (L), reduction phenylsilane produce various useful synthetic intermediates compounds.

Язык: Английский

---

Skeletal Formation of Carbocycles with CO₂: Selective Synthesis of Indolo[3,2-b]carbazoles or Cyclophanes from Indoles, CO₂, and Phenylsilane

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(22), С. 14935 - 14941

Опубликована: Май 9, 2024

The catalytic reactions of indoles with CO2 and phenylsilane afforded indolo[3,2-b]carbazoles, where the fused benzene ring was constructed by forming two C–H bonds four C–C molecules via deoxygenative conversions. Nine-membered cyclophanes made up three were also obtained, cyclophane framework six bonds. These multicomponent cascade giving completely different carbocycles switched simply choosing solvent, acetonitrile or ethyl acetate.

Язык: Английский

---

Diastereoselective Formal [3+3] Cascade Cyclization towards Fused 4‐Fluoroalkylated 3,4‐Dihydro‐2H‐pyrans via Copper Catalysis

Chinese Journal of Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Апрель 25, 2025

Comprehensive Summary The cycloaddition and annulation reactions offer a powerful method toward various important substituted 3,4‐dihydro‐2 H ‐pyran architectures. Nevertheless, the transformation for preparing fused‐polycyclic ones still remains challenging yet highly desirable until now. Herein, we report novel formal [3+3] cascade cyclization reaction to provide lactam‐fused 4‐fluoroalkylated 3,4‐dihydropyran skeletons bearing three contiguous tertiary carbon centers via copper catalysis. Of note, these annulations proceeded in an exclusively diastereoselective manner through successive inert C(sp 2 )‐Cl 3 )‐H functionalization, which exhibited site‐selectivity stereoselectivity. Additionally, evaluations on biological activities of obtained products revealed that several display inhibitory activity against Siha H1975 cancer cell lines.

Язык: Английский

---

Bimolecular reduction of carbon dioxide: double synthons for alkynes trifunctionalization

Science China Chemistry, Год журнала: 2023, Номер 67(3), С. 841 - 847

Опубликована: Дек. 14, 2023

Язык: Английский

---

Convenient partial reduction of CO2 to a useful C1 building block: efficient access to 13C‐labelled N‐heterocyclic carbenes

ChemCatChem, Год журнала: 2024, Номер unknown

Опубликована: Окт. 8, 2024

Abstract The selective, transition metal‐free hydrosilylation of CO 2 to CH (OSiEt 3 ) has been achieved under mild conditions and in high isolated yields (up 90%) by using Et SiH the simple, easily prepared borohydride catalyst Li + [HB(C 6 F 5 ] − . resulting ‐derived bis(silyl)acetal product—whose mechanism formation interrogated through detailed computational experimental studies—can be rapidly valorized facile synthesis N ‐heterocyclic carbenes, via their corresponding imidazolium salts. By relatively inexpensive, isotopically enriched 13 this protocol can exploited prepare NHC isotopologues that are selectively C labelled at key, ligating C2 position. This provides an electronically responsive NMR spectroscopic handle with dramatically enhanced sensitivity, which directly benefit reactivity studies both organo‐ organometallic catalysis, where use is ubiquitous.

Язык: Английский

---

Six-membered ring systems: With O and/or S atoms

Progress in heterocyclic chemistry, Год журнала: 2024, Номер unknown, С. 421 - 484

Опубликована: Янв. 1, 2024

Язык: Английский

---