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5,683 Newest Publications of Thieme Verlag

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Convergent Total Synthesis of (±)-Apomorphine via Benzyne Chemistry: Insights into the Mechanisms Involved in the Key Step

20-Jun-2017 | Ana Carolina A. Muraca; Givago P. Perecim; Alessandro Rodrigues; Cristiano Raminelli, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1588855 Convergent total synthesis of (±)-apomorphine hydrochloride was accomplished by an approach that employs in the key step a sequence of transformations involving a [4+2]-cycloaddition reaction followed by a hydrogen migration. Through this sequence of ...

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Tetrabutylammonium Iodide Catalyzed Epoxidation of Naphthoquinone Derivatives with tert-Butyl Hydroperoxide as an Oxidant

20-Jun-2017 | Bai-Ru Ai; Xu-Ling Chen; Yu Dong; Lei Tang; Ji-Yu Wang, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1589035 An efficient and environmentally benign procedure has been developed for the epoxidation of naphthoquinone derivatives by using tetrabutylammonium iodide as a catalyst and tert-butyl hydroperoxide as an oxidant in the presence of silicon dioxide. This ...

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Impact of Electronic Effects on the Nucleofugality of Leaving Groups

20-Jun-2017 | Bernard Denegri; Mirela Matić; Olga Kronja, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1590792 A short review of the development of nucleofugality and electrofugality scales based on solvolysis rates of benzhydryl derivatives is presented. Accordingly, the rate of the heterolytic step in the SN1 displacement reaction and the leaving group ability ...

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Temperature-Controlled Bidirectional Enantioselectivity in Asymmetric Hydrogenation Reactions Utilizing Stereodynamic Iridium Complexes

20-Jun-2017 | Max Siebert; Golo Storch; Frank Rominger; Oliver Trapp, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1588861 Stereochemically flexible 2,2(-bis(diphenylphosphino)biphenyl (BIPHEP) ligands were modified with chiral α-substituted carboxylic acid auxiliaries in the 3- and 3′-position. The resulting central-to-axial chirality transfer to the stereochemically flexible ...

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SYNFORM ISSUE 2017/07

20-Jun-2017 | Matteo Zanda, Synthesis, 2017

Synthesis 2017; 49: A105-A122DOI: 10.1055/s-0036-1590288 © Georg Thieme Verlag KG Stuttgart · New York Artikel in Thieme eJournals:Inhaltsverzeichnis

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Synthesis of l-Ribose from d-Ribose by a Stereoconversion through Sequential Lactonization as the Key Transformation

20-Jun-2017 | Jaeyoung Ban; Saira Shabbir; Minkyung Lim; Byunghoon Lee; Hakjune Rhee, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1588857 l-Ribose, a key precursor of various l-nucleosides can only be synthesized from other sugars or other non-sugar precursors. Herein, the study involves the synthesis of naturally rare l-ribose from readily available d-ribose. Though, many ...

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SYNFORM ISSUE 2017/07

20-Jun-2017 | Matteo Zanda, Synlett, 2017

Synlett 2017; 28: A105-A122DOI: 10.1055/s-0036-1590289 © Georg Thieme Verlag KG Stuttgart · New York Artikel in Thieme eJournals:Inhaltsverzeichnis

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A Neutral Metal-Free System for Head-to-Tail Dimerization of Electron-Rich Alkenes

20-Jun-2017 | A-Yun Luo; Yan Bao; Xiu-Fen Cheng; Xi-Sheng Wang, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1589039 A neutral metal-free system for the head-to-tail dimerization of electron-rich alkenes with stoichiometric amount of BrCCl2H and NaI is reported. This reaction proceeds under mild conditions with high efficiency and broad scope.[...] ©Georg Thieme Verlag ...

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Boronic Acid Catalysis for Aza-Piancatelli Rearrangement

20-Jun-2017 | Wu-Bang Tang; Kou-Sen Cao; Shan-Shui Meng; Wen-Hua Zheng, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1589040 A first example of boronic acid catalyzed intermolecular aza-Piancatelli rearrangement to access a wide range of trans-4,5-disubstituted cyclopentenones is described. The catalytic system can also be extended to intramolecular aza-Piancatelli rearrangement to ...

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Brønsted Acid Catalyzed C3-Alkylation of 2-Indolylmethanols with Azlactones via an Umpolung Strategy

20-Jun-2017 | Yang Shen; Zi-Qi Zhu; Jin-Xi Liu; Lei Yu; Bai-Xiang Du; Guang-Jian Mei; Feng Shi, Synthesis, 2017

SynthesisDOI: 10.1055/s-0036-1589036 An efficient method for the synthesis of C3-alkylated indoles has been established via Brønsted acid catalyzed alkylation of 2-indolylmethanols with azlactones. The reaction exhibits broad substrate scope and delivers high yields (22 examples, up to 99% ...

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