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Lewis Acid Catalyzed (3+2)-Annulations of Donor-Acceptor Cyclopropanes and Ynamides
(Organic Letters, 2014)
The Sc(OTf)(3)-catalyzed (3 + 2)-annulation of donor acceptor cyclopropanes and ynamides is described, providing the corresponding cyclopentene sulfonamides in good to excellent yield. Deprotection and hydrolysis of the ...
Novel and Stereospecific Synthesis of (2S)-3-(2,4,5-Trifluorophenyl)propane-1,2-diol from D-Mannitol
(Helvetica Chimica Acta, 2015)
A stereospecific synthesis of (2S)-3-(2,4,5-trifluorophenyl)propane-1,2-diol from D-mannitol has been developed. The reaction of 2,3-O-isopropylidene-D-glyceraldehyde with 2,4,5-trifluorophenylmagnesium bromide gave ...
Novel and enantioselective syntheses of (R)- and (S)-3-hydroxy-4-(2,4,5-trifluorophenyl)butanoic acid: a synthon for sitagliptin and its derivatives
(Tetrahedron, 2012)
A new synthetic strategy for (R)- and (S)-3-hydroxy-4-(2,4,5-trifluorophenyl)butanoic acid, a building block in the preparation of sitagliptin and its derivatives, was developed. Pd(OAc)(2) catalyzed coupling of ...
Heteroarylboronates in Rhodium-Catalyzed 1,4-Addition to Enones
(Organic Letters, 2014)
Rhodium(I)-catalyzed 1,4-addition of aryl and alkenylboronic acids to alpha,beta-unsaturated carbonyl compounds is well established, but the transfer of heteroaryl residues in this reaction remains underdeveloped. We have ...
Highly diastereoselective synthesis of a novel functionalized triepoxytrinaphthylene
(Arkivoc, 2018)
The high yielding synthesis of a novel benzocyclotrimer is herein presented. The syn-diastereomer is obtained as major product, presumably in virtue of the presence of an oxa-bridge of the bicylic components. The three ...
An efficient protocol for the synthesis of brominated norbornene, norbornadiene, and benzonorbornadiene
(TURKISH JOURNAL OF CHEMISTRY, 2019)
An efficient protocol for the synthesis of 2-bromonorbornene, 2-bromonorbornadiene, 2-bromoben-zonorbornadiene, 2,3-dibromonorbornene, 2,3-dibromonorbornadiene, and 2,3-dibromobenzonorbornadiene in good yields has been ...
Bromination of quinoxaline and derivatives: Effective synthesis of some new brominated quinoxalines
(Tetrahedron, 2017)
The synthesis of brominated quinoxaline derivatives starting from several kinds of quinoxaline by different bromination strategies was studied. First the synthesis of some brominated quinoxalines was accomplished along ...
1,2-Dibromotetrachloroethane: an efficient reagent for many transformations by modified Appel reaction
(TURKISH JOURNAL OF CHEMISTRY, 2019)
An efficient and facile method has been developed for the synthesis of alkyl bromides from various alcohols under mild conditions using a triphenylphosphine (PPh3)/1,2-dibromotetrachloroethane (DBTCE) complex in excellent ...
Enantiospecific Synthesis of (R)-3-Amino-4-(2,4,5-trifluorophenyl)butanoic Acid Using (S)-Serine as a Chiral Pool
(Helvetica Chimica Acta, 2015)
Starting from (S)-serine, a new method was developed for the synthesis of the beta-amino acid part of sitagliptin in ten steps and with an overall yield of 30%. The crucial step of the synthesis was the ring opening of ...
Bazı Organik Halojenürlerin Sentezi ve Çeşitli Transformasyonlarda Kullanımı
(0-Belirlenecek, 2015)
endo-81 ve exo-81’in bakır(I) 2-tiyofenkarboksilat ile reaksiyonu diastereoselektif Cs-simetrik syn-83’ün oluşumu ile sonuçlandı. Karbenoid siklopropanın kenetleme mekanizması tartışıldı. p-Benzokinon kaynaşık norbornadien ...
