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2,689 Newest Publications about the topic heterocycles

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Natural product syntheses via carbonylative cyclizations

26-Jun-2018 | Kaiqing Ma; Brandon S. Martin; Xianglin Yin; Mingji Dai, Natural Product Reports, 2018

Covering: 2000–2018In this review, we highlight recent examples of natural product total syntheses employing transition metal-mediated/catalyzed carbonylative cyclization strategies to build key ring systems. It mainly covers carbonylative cyclizations for the construction of O-heterocycles, ...

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p-TsOH Promoted Synthesis of Benzo-Fused O-Heterocycles from Alkynols via Ring Contraction and C-O Scission Strategy

26-Jun-2018 | Gopal Chandru Senadi; Jeh-Jeng Wang, Green Chemistry, 2018

We here report the first divergent synthesis of benzo-fused O-heterocycles by p-toluene sulfonic acid promoted cascade reactions involving alkyne hydration, double cyclization, ring contraction and C-O bond cleavage from alkynols. Reaction mechanism was validated by obtaining the x-ray structure ...

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Transition-metal-free oxidative cyclization of N-propargyl ynamides: stereospecific construction of linear polycyclic N-heterocycles

26-Jun-2018 | Cai-Ming Wang; Lin-Jun Qi; Qing Sun; Bo Zhou; Zhi-Xin Zhang; Zai-Fa Shi; Shui-Chao Lin; Xin Lu; Lei Gong; Long-Wu Ye, Green Chemistry, 2018

An efficient NaBArF4-catalyzed oxidative cascade cyclization of N-propargyl ynamides has been developed, where NaBArF4 is demonstrated for the first time to be a highly effective catalyst for promoting such an oxidative cyclization. Importantly, this transition metal-free process strongly ...

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C(sp2)–H functionalization of aldehyde-derived hydrazones via a radical process

01-Jun-2018 | Xiaoyan Xu; Jun Zhang; Hongguang Xia; Jie Wu, Organic & Biomolecular Chemistry, 2018

This review is focused on the recent advances in the C(sp2)–H functionalization of aldehyde-derived hydrazones via a radical process. Diverse substituted hydrazones including N-heterocycles are afforded under mild conditions with excellent selectivities. In general, an aminyl radical as the key ...

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C(sp2)–H functionalization of aldehyde-derived hydrazones via a radical process

01-Jun-2018 | Xiaoyan Xu; Jun Zhang; Hongguang Xia; Jie Wu, Organic & Biomolecular Chemistry, 2018

This review is focused on the recent advances in the C(sp2)–H functionalization of aldehyde-derived hydrazones via a radical process. Diverse substituted hydrazones including N-heterocycles are afforded under mild conditions with excellent selectivities. In general, an aminyl radical as the key ...

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Novel functionalized organotellurides with enhanced thiol peroxidase catalytic activity

31-May-2018 | Damiano Tanini; Anna Grechi; Lorenzo Ricci; Silvia Dei; Elisabetta Teodori; Antonella Capperucci, New Journal of Chemistry, 2018

The thiol peroxidase-like activity of a series of novel functionalized tellurium containing catalysts has been investigated with different models. Dialkyl- and aryl-alkyl-tellurides, conveniently achieved through the ring opening of strained heterocycles, exhibited remarkable catalytic ...

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A distinctive transformation based diversity oriented synthesis of small ring carbocycles and heterocycles from biocatalytically derived enantiopure [small alpha]-substituted-[small beta]-hydroxyesters

30-May-2018 | Joydev Halder; Debabrata Das; Samik Nanda, Organic & Biomolecular Chemistry, 2018

A series of structurally novel small ring carbocyclic and heterocyclic molecules were accessed in an enantiopure fashion. The starting materials, α-substituted-β-hydroxyesters, were achieved through the biocatalytic dynamic kinetic resolution of parent β-ketoesters in an excellent enantio and ...

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Mannich reaction of trifluoroacetaldehyde hydrazones: a useful entry to trifluoromethyl substituted heterocycles

30-May-2018 | Shuanglong Jia; Laurent El Kaim, Organic & Biomolecular Chemistry, 2018

NH-aryl hydrazones derived from trifluoroacetaldehyde hemiacetal may be involved in efficient Mannich type reactions with formaldehydes and aromatic aldehydes. The resulting hydrazones are useful building blocks for the preparation of trifluoromethyl substituted heterocycles as shown by a ...

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A nitrogen-ligated nickel-catalyst enables selective intermolecular cyclisation of [small beta]- and [gamma]-amino alcohols with ketones: access to five and six-membered N-heterocycles

30-May-2018 | Khushboo Singh; Mari Vellakkaran; Debasis Banerjee, Green Chemistry, 2018

Owing to the great demand for the synthesis of N-heterocycles, development of new reactions that utilise renewable resources and convert them into key chemicals using non-precious base metal-catalysts is highly desirable. Herein, we demonstrated a sustainable Ni-catalysed dehydrogenative approach ...

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Photodynamic properties of aza-analogues of phthalocyanines

30-May-2018 | Miroslav Miletin; Petr Zimcik; Veronika Novakova, Photochemical & Photobiological Sciences, 2018

The replacement of benzene rings in phthalocyanines with various N-heterocycles produces a number of aza-analogues, azaphthalocyanines. This review summarizes their properties important for photodynamic therapy with a focus on (but not limited to) the most studied derivatives, i.e. ...

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