Results 111 to 120 of about 48,499 (273)

Nucleophilic Addition to (3-Methylpentadienyl)iron(1+) Cations: Counterion Control of Regioselectivity; Application to the Enantioselective Synthesis of 4,5-Disubstituted Cyclohexenones [PDF]

, 2006
The regioselectivity of malonate addition to (3-methylpentadienyl)Fe(CO)3+ is controlled by the malonate−counterion association. The Li+ salt of malonate proceeds via C1 nucleophilic attack to afford the 1,3Z-diene complex 4a, while reaction of highly ...
Chaudhury, Subhabrata, Donaldson, William   +1 more
core   +1 more source

AgBF4‐Induced Site‐Selective Synthesis of 4‐Sulfonylindoles in Au‐Catalyzed Cyclization‐Sulfonyl Migration Reactions

Chemistry – A European Journal, EarlyView.
Site‐selective synthesis 4‐suflonylindoles was achieved by a cyclization‐rearrangement strategy by π‐Lewis acidic gold catalysts and the aid of silver cocatalyst. Particularly, the use of 3 equivalents of AgBF4 to SPhosAuCl is crucial for C4‐selective migration of the sulfonyl group.
Itaru Nakamura, Chunbo Jia, Masahiro Terada   +2 more
wiley   +1 more source

An Exploratory Study of the Enzymatic Hydroxycinnamoylation of Sucrose and Its Derivatives

Molecules
Phenylpropanoid sucrose esters are a large and important group of natural substances with significant therapeutic potential. This work describes a pilot study of the enzymatic hydroxycinnamoylation of sucrose and its derivatives which was carried out ...
Matej Cvečko, Vladimír Mastihuba, Mária Mastihubová   +2 more
doaj   +1 more source

Regioselective Arylboration of 1,3‐Butadiene

Israel Journal of Chemistry, 2019
AbstractA method for the regioselective 1,2‐arylboration of 1,3‐butadiene, a feedstock chemical, is reported. The reactions result in the formation of products that can be easily elaborated to other structures. The mechanistic details of this process are also discussed.
Allison M. Bergmann, Stephen R. Sardini, Kevin B. Smith, M. Kevin Brown   +3 more
openaire   +3 more sources

Harnessing Toluene Solvent as a Reactant: Regioselective Benzyl Radical Addition to Multi‐π 1,5‐Enynes in a Copper‐Catalyzed Cascade to Indenes

Chemistry – A European Journal, EarlyView.
A copper‐catalyzed three‐component radical cascade of 1,5‐enynes with toluene and benzoic acids enables regioselective benzyl radical addition to multi‐Π systems, efficiently delivering polysubstituted indenes from an abundant solvent feedstock. ABSTRACT C─H activation of toluene generates a benzyl radical that undergoes C─C coupling, converting an ...
Saideh Rajai‐Daryasarei, Fatemeh Chahardehi, Mohammad Mahdi Sharifani, Morteza Jamshidi, Robert Stranger, Frank Rominger, Alireza Ariafard, Saeed Balalaie   +7 more
wiley   +1 more source

Green Polymer Chemistry: Enzyme Catalysis for Polymer Functionalization

Molecules, 2015
Enzyme catalyzed reactions are green alternative approaches to functionalize polymers compared to conventional methods. This technique is especially advantageous due to the high selectivity, high efficiency, milder reaction conditions, and recyclability ...
Sanghamitra Sen, Judit E. Puskas
doaj   +1 more source

Regioselective Substitution of BINOL

Chemical Reviews
1,1'-Bi-2-naphthol (BINOL) has been extensively used as the chirality source in the fields of molecular recognition, asymmetric synthesis, and materials science. The direct electrophilic substitution at the aromatic rings of the optically active BINOL has been developed as one of the most convenient strategies to structurally modify BINOL for diverse ...
openaire   +2 more sources

Regio‐ and Diastereoselective C–C Silylation of Cyclopropyl Acetates Harnessing Fluorinated Poly(pyridyl)Borate Rhodium Catalysts

Chemistry – A European Journal, EarlyView.
Fluorinated poly(pyridyl)borates have been utilized to stabilize rhodium‐diene complexes and as supporting ligands in rhodium‐catalyzed redox‐neutral C–C silylation of cyclopropyl acetates, producing silicon‐containing heterocyclic products, dioxasilolanes.
Vo Quang Huy Phan, Suman Das Adhikary, Junha Jeon, H. V. Rasika Dias   +3 more
wiley   +1 more source

Synthesis of 1‐Alkynylboronates, 1,1‐Diborylalkenes, and 1,1,1‐Triborylalkanes: Challenges and Opportunities

Chemistry – A European Journal, EarlyView.
ABSTRACT In the field of organoboron chemistry, multi(boronate) esters have emerged as crucial intermediates, with various applications in synthetic chemistry, material technology, and life sciences. This mini‐review discusses recent advancement in the synthesis of these versatile compounds, particularly alkynylboronates, 1,1‐diborylalkenes, and 1,1,1 ...
Son Hoai Doan, Vu Nguyen Tran, Thanh Vinh Nguyen   +2 more
wiley   +1 more source

Copper-promoted C5-selective bromination of 8-aminoquinoline amides with alkyl bromides

Beilstein Journal of Organic Chemistry
An efficient and practical method for the synthesis of C5-brominated 8-aminoquinoline amides via a copper-promoted selective bromination of 8-aminoquinoline amides with alkyl bromides was developed.
Changdong Shao, Chen Ma, Li Li, Jingyi Liu, Yanan Shen, Chen Chen, Qionglin Yang, Tianyi Xu, Zhengsong Hu, Yuhe Kan, Tingting Zhang   +10 more
doaj   +1 more source