Cihangir Tanyeli

Department of Chemistry
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Recyclable Organocatalysts in Asymmetric Synthesis
Susam, Zeynep Dilşad; Tanyeli, Cihangir (2021-05-01)
Chiral organocatalysts are extensively in demand over the past 30 years for the synthesis of asymmetric compounds with remarkable stereoselectivities in high yields. In addition to these great facilities, they are eco-frie...
The synthesis of chiral β-naphthyl-β-sulfanyl ketones via enantioselective sulfa-Michael reaction in the presence of a bifunctional cinchona/sulfonamide organocatalyst
Tözendemir, Deniz; Tanyeli, Cihangir (2021-02-01)
Cinchona alkaloid-derived organocatalysts are widely employed in various asymmetric transformations, yielding products with high enantiopurity. In this respect, a bifunctional quinine-derived sulfonamide organocatalyst was...
Enantioselective Friedel-Crafts alkylation of indole with nitroalkenes in the presence of bifunctional squaramide organocatalysts
Dündar, Esra; Tanyeli, Cihangir (2021-01-01)
© 2021 Elsevier LtdA series of chiral bifunctional quinine and 2-aminoDMAP based squaramide organocatalysts are evaluated in Friedel-Crafts alkylation of indoles with nitroolefins. These 3-substituted indole derivatives ar...
Bifunctional squaramide catalyzed stereoselective Mannich reaction of alpha-azido ketones with isatin-derived ketimines
KARAHAN, SEDA; Tanyeli, Cihangir (Royal Society of Chemistry (RSC), 2020-01-21)
Asymmetric organocatalytic Mannich reaction of alpha-azido ketones and N-Boc protected isatin-derived ketimines were investigated for the first time. Examination of both 2-adamantyl and 3,5-bis(trifluoromethyl)aniline subs...
Squaramide catalyzed alpha-chiral amine synthesis
Karahan, SEDA; Tanyeli, Cihangir (2018-10-17)
Enantiomerically pure alpha-chiral amines, have been commonly utilized as resolving agents and chiral auxiliaries and are currently found in 40% of active pharmaceutical ingredients. Hence, development of highly stereosele...
Enantioselective sulfa-Michael addition reaction of methyl thioglycolate to chalcones derivatives with sterically encumbered quinine squaramide organocatalyst
HASILCIOĞULLARI, DENİZ; Tanyeli, Cihangir (2018-04-04)
Asymmetric organocatalytic sulfa-Michael reactions give access to enantiomerically enriched sulfur containing adducts that can be used as valuable chiral building blocks. A variety of chalcone derivatives were allowed to r...
Asymmetric organocatalytic direct Mannich reaction of acetylacetone and isatin derived ketimines: Low catalyst loading in chiral cinchona-squaramides
İŞİBOL, Duygu; Karahan, SEDA; Tanyeli, Cihangir (2018-02-07)
A highly enantioselective synthesis of 3-amino-2-oxindoles by direct Mannich reaction between acetylacetone and N-carbamoyl isatin ketimine has been described herein. Corresponding chiral adducts were obtained in high yiel...
Organocatalytic enantioselective construction of isatin-derived N-alkoxycarbonyl 1,3-aminonaphthols via sterically encumbered hydrocarbon-substituted quinine-based squaramide
Karahan, SEDA; Tanyeli, Cihangir (2017-09-07)
Herein, an illustrative example to synthesize chiral naphthoxazepine precursors via the aza-Friedel-Crafts reaction of N-alkoxycarbonyl isatin ketimines with naphthol using a new 2-adamantyl-substituted quinine-derived squ...
Enantioselective aza-Henry reaction of t-Boc protected imines and nitroalkanes with bifunctional squaramide organocatalysts
Susam, Zeynep Dilşad; Tanyeli, Cihangir (2017-05-07)
An organocatalytic asymmetric aza-Henry reaction of t-Boc protected imines with nitroalkanes has been established by chiral acid-base type bifunctional Cinchona alkaloid/squaramide organocatalysts. The cooperation of a qui...
Asymmetric organocatalytic Michael additions of methyl thioglycolate to various acceptors
Tözendemir, Deniz; Tanyeli, Cihangir (2017-04-06)
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