Copper-Catalyzed Functionalization of 1,3-Dienes: Hydrofunctionalization, Borofunctionalization, and Difunctionalization

ACS Catalysis, Год журнала: 2019, Номер 10(2), С. 1485 - 1499

Опубликована: Дек. 18, 2019

The catalytic conversion of chemical feedstocks into products medicinal and agricultural value is a key theme across modern synthetic chemistry. As 1,3-dienes are readily available from industrial cracking processes, there great interest in the development sustainable methods for functionalization these simple molecules. Although initial developments this field have required precious-transition-metal catalysts, has been push toward use inexpensive, nontoxic, more abundant copper catalysts to promote functionalization. This Perspective covers many area copper-catalyzed 1,3-dienes, particular hydrofunctionalization, borofunctionalization, difunctionalization (e.g., diamination).

Язык: Английский

---

Catalytic Enantio- and Regioselective Addition of Nucleophiles in the Intermolecular Hydrofunctionalization of 1,3-Dienes

ACS Catalysis, Год журнала: 2019, Номер 10(2), С. 1060 - 1076

Опубликована: Дек. 12, 2019

Catalytic enantioselective synthesis of small-molecule building blocks with allylic stereogenic centers is an important objective in organic synthesis, but preparing this motif wherein the adjacent olefin 1,2-disubstituted a single step tremendous challenge. Late-transition-metal-catalyzed intermolecular couplings nucleophiles and 1,3-dienes hydrofunctionalization reactions have quickly emerged as compelling approach to these related compounds. In Perspective, we illustrate how diene hydrofunctionalizations provided avenue complex, highly desirable chemical space that not readily accessed by other technologies. We also aim provide some insight into varying mechanistic pathways nuances myriad help inform future reaction catalyst design.

Язык: Английский

---

Synergistic Pd/Amine-Catalyzed Stereodivergent Hydroalkylation of 1,3-Dienes with Aldehydes: Reaction Development, Mechanism, and Stereochemical Origins

Journal of the American Chemical Society, Год журнала: 2021, Номер 143(29), С. 10948 - 10962

Опубликована: Июль 15, 2021

Metal-hydride-catalyzed hydroalkylation of 1,3-dienes with enolizable carbonyl compounds is an atom- and step-economical method for preparing chiral molecules allylic stereocenters. Although high diastereo- enantioselectivities have been achieved many coupling partners, aldehydes not yet used this purpose because they are less stable than other under basic conditions the potential to rapidly epimerize at α-position. Moreover, stereodivergent reactions access complementary diastereomers vicinal stereocenters challenging. Herein, we describe a synergistic palladium/amine catalyst system that allowed us achieve first aldehydes. By choosing appropriate combination palladium amine catalysts, could obtain either syn or anti products, therefore provides highly enantioselective α,β-vicinal Density functional theory calculations revealed mechanism involving PdH formation migratory insertion into alkene, followed by C–C bond formation. The origin stereoselectivities was investigated means distortion/interaction analysis.

Язык: Английский

---

Nickel‐Catalyzed Asymmetric Reductive Carbo‐Carboxylation of Alkenes with CO₂

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(25), С. 14068 - 14075

Опубликована: Апрель 1, 2021

Abstract Reductive carboxylation of organo (pseudo)halides with CO 2 is a powerful method to provide carboxylic acids quickly. Notably, the catalytic reductive carbo‐carboxylation unsaturated hydrocarbons via fixation highly challenging but desirable approach for structurally diverse acids. There are only few reports and no examples alkenes transition metal catalysis. We report first asymmetric nickel A variety aryl (pseudo)halides, such as bromides, triflates inert chlorides particular note, undergo reaction smoothly give important oxindole‐3‐acetic acid derivatives bearing C3‐quaternary stereocenter. This transformation features mild conditions, wide substrate scope, facile scalability, good excellent chemo‐, regio‐ enantioselectivities. The highlights formal synthesis (−)‐Esermethole, (−)‐Physostigmine (−)‐Physovenine, total (−)‐Debromoflustramide B, (−)‐Debromoflustramine B (+)‐Coixspirolactam A; thereby, opening an avenue chiral natural products .

Язык: Английский

---

From Hydrogenation to Transfer Hydrogenation to Hydrogen Auto-Transfer in Enantioselective Metal-Catalyzed Carbonyl Reductive Coupling: Past, Present, and Future

ACS Catalysis, Год журнала: 2021, Номер 11(9), С. 5572 - 5585

Опубликована: Апрель 22, 2021

Atom-efficient processes that occur via addition, redistribution or removal of hydrogen underlie many large volume industrial and pervade all segments chemical industry. Although carbonyl addition is one the oldest most broadly utilized methods for C-C bond formation, delivery non-stabilized carbanions to compounds has relied on premetalated reagents metallic/organometallic reductants, which pose issues safety challenges vis-à-vis implementation. Catalytic reductive couplings promoted hydrogenation, transfer hydrogenation auto-transfer allow abundant unsaturated hydrocarbons serve as substitutes organometallic reagents, enabling formation in absence stoichiometric metals. This perspective (a) highlights past milestones catalytic auto-transfer, (b) summarizes current enantioselective couplings, (c) describes future opportunities based patterns reactivity animate transformations this type.

Язык: Английский

---

Cu-Catalyzed Asymmetric Dicarboxylation of 1,3-Dienes with CO₂

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(5), С. 2919 - 2927

Опубликована: Янв. 26, 2024

Dicarboxylic acids and derivatives are important building blocks in organic synthesis, biochemistry, the polymer industry. Although catalytic dicarboxylation with CO2 represents a straightforward sustainable route to dicarboxylic acids, it is still highly challenging limited generation of achiral or racemic acids. To date, asymmetric give chiral has not been reported. Herein, we report first 1,3-dienes via Cu catalysis. This strategy provides an efficient environmentally benign high regio-, chemo-, enantioselectivities. The copper self-relay catalysis, that is, Cu-catalyzed boracarboxylation carboxylated allyl boronic ester intermediates subsequent carboxylation C–B bonds dicarboxylates, key success this dicarboxylation. Moreover, protocol exhibits broad substrate scope, good functional group tolerance, easy product derivatizations, facile synthesis liquid crystalline polyester drug-like scaffolds.

Язык: Английский

---

Catalytic Regio- and Enantioselective Boracarboxylation of Arylalkenes with CO₂ and Diboron

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(5), С. 2888 - 2894

Опубликована: Янв. 26, 2024

Catalytic asymmetric carboxylation of readily available alkenes with CO2, an abundant and sustainable one-carbon building block, that gives access to value-added α-stereogenic carboxylic acids in atom- step-economic manner is highly attractive. However, it has remained a formidable challenge for the synthetic community. Here, first example Cu-catalyzed regio- enantioselective boracarboxylation reaction on various arylalkenes diboron under atmospheric pressure CO2 described, which afforded variety chiral β-boron-functionalized α-aryl up 87% yield 97% ee mild conditions. Importantly, α-substituted could also be subject this protocol excellent enantiopurities, thereby rendering efficient approach generation enantioenriched α-chiral all-carbon quaternary center. Moreover, high functional group tolerance, scalable synthesis, facile bioactive compounds, like (−)-scopolamine, (−)-anisodamine, (−)-tropicamide, further demonstrated utility strategy.

Язык: Английский

---

Palladium-Catalyzed Regio- and Enantioselective Hydrosulfonylation of 1,3-Dienes with Sulfinic Acids: Scope, Mechanism, and Origin of Selectivity

Journal of the American Chemical Society, Год журнала: 2020, Номер 142(37), С. 15860 - 15869

Опубликована: Авг. 19, 2020

Chiral sulfones are important structural motifs in organic synthesis because of their widespread use pharmaceutical chemistry. In particular, chiral allylic have drawn particular interest synthetic utility. However, enantioselective 1,3-disubstituted unsymmetrical remains a challenge. this article, we report protocol for (R)-DTBM-Segphos/Pd-catalyzed regio- and hydrosulfonylation 1,3-dienes with sulfinic acids, which provides atom- step-economical access to sulfones. The reaction occurs under mild conditions has broad substrate scope. Combined experimental computational studies suggest that the is initiated by ligand-to-ligand hydrogen transfer followed C–S bond reductive elimination via six-membered transition state. Steric repulsion between olefinic C–H tert-butyl group (R)-DTBM-Segphos was found be key factor enantiocontrol.

Язык: Английский

---

Recent advances in asymmetric synthesis with CO2

Science China Chemistry, Год журнала: 2020, Номер 63(10), С. 1336 - 1351

Опубликована: Июль 20, 2020

Язык: Английский

---

Recent progress and challenges in carboxylation with CO2

Current Opinion in Green and Sustainable Chemistry, Год журнала: 2021, Номер 32, С. 100525 - 100525

Опубликована: Июнь 8, 2021

Язык: Английский

---