Towards organo-click reactions: development of pharmaceutical ingredients by using direct organocatalytic bio-mimetic reductions
作者:Dhevalapally B. Ramachary、G. Babul Reddy
DOI:10.1039/b612611a
日期:——
Economic and environmentally friendly bio-mimetic one-pot three and four-component Knoevenagel–hydrogenation (K–H), five-component Knoevenagel–hydrogenation–alkylation (K–H–A) and six-component Knoevenagel–hydrogenation–alkylation–Huisgen cycloaddition (K–H–A–HC) reactions of aldehydes, CH-acids, o-phenylenediamine, alkyl halides and azides using proline, proline–metal carbonate and proline–metal carbonate–CuI-catalysis, respectively have been developed. Many of K–H and K–H–A compounds have direct application in pharmaceutical chemistry.
Reaction of 3-arylidenepropenoic acid derivatives with triethylamine and other amines; unexpected reductions and vinylogations
作者:Attimogae Shivamurthy Harisha、Suresh Parameshwar Nayak、Kuppuswamy Nagarajan、Tayur Narasingarow Guru Row、Amar A. Hosamani
DOI:10.1016/j.tet.2016.03.097
日期:2016.6
Exposure of ethyl 2-cyano-3-(2-methoxy-5-nitrophenyl)acrylate 1f to triethylamine in hot ethanol resulted in the formation of the dihydro derivative 2f and vinylogue 3f in high yields. Single crystal X-ray data are provided for 3f. Similar reactions were observed for various analogues. The reaction was studied changing aryl substituent, amines and solvents. Pyridyl, thienyl analogues were also examined
Room Temperature, Reductive Alkylation of Activated Methylene Compounds: Carbon–Carbon Bond Formation Driven by the Rhodium-Catalyzed Water–Gas Shift Reaction
作者:Scott E. Denmark、Malek Y. S. Ibrahim、Andrea Ambrosi
DOI:10.1021/acscatal.6b03183
日期:2017.1.6
The rhodium-catalyzed water–gas shift reaction has been demonstrated to drive the reductive alkylation of several classes of activated methylene compounds at room temperature. Under catalysis by rhodium trichloride (2–3 mol %), carbon monoxide (10 bar), water (2–50 equiv), and triethylamine (2.5–7 equiv), the scope has been successfully expanded to cover a wide range of alkylating agents, including
Asymmetric Reaction of <i>p</i>-Quinone Diimide: Organocatalyzed Michael Addition of α-Cyanoacetates
作者:Sivakumar N. Reddy、Venkatram R. Reddy、Shrabani Dinda、Jagadeesh Babu Nanubolu、Rajesh Chandra
DOI:10.1021/acs.orglett.8b00771
日期:2018.5.4
Hitherto unknown catalytic enantioselective transformation of p-quinone diimides is achieved using chiral bifunctional organic molecules. Bifunctional thiourea compounds catalyze the Michael addition of cyanoacetates with excellent yields and enantioselectivities. The initially formed Michael adducts undergo cyclization to yield functionally rich, fused cyclic imidines bearing a quaternary benzylic
efficient approach was developed for the α-alkylation of various nitriles with carbonyl compounds using ruthenium-amido complex catalyst 1. The C-C bond was formed through aldol reaction followed by hydrogenation with triethylamine-formic acid (TEAF) and 1. Moderate to high yields were obtained, and a variety of functional groups were tolerated, including nitro and chloro groups, and a furan ring. ruthenium-amido