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5 article(s) from Li, Li

Copper-promoted C5-selective bromination of 8-aminoquinoline amides with alkyl bromides

Changdong Shao,
Chen Ma,
Li Li,
Jingyi Liu,
Yanan Shen,
Chen Chen,
Qionglin Yang,
Tianyi Xu,
Zhengsong Hu,
Yuhe Kan and
Tingting Zhang

Beilstein J. Org. Chem. 2024, 20, 155–161, doi:10.3762/bjoc.20.14

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Scheme 1: Methods for the C5-selective bromination of 8-aminoquinoline amides.

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Scheme 2: Substrate scope of the 8-aminoquinoline amides. Reaction conditions: 1 (0.2 mmol), 2a (0.8 mmol), C...

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Scheme 3: Substrate scope of the bromoalkanes. Reaction conditions: 1a (0.2 mmol), 2 (0.8 mmol), Cu(OAc)₂·H₂O...

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Scheme 4: Further substrate scope investigations and gram-scale application.

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Scheme 5: Control experiments and proposed mechanism.

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Published 23 Jan 2024

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Asymmetric Mannich reactions of (S)-N-tert-butylsulfinyl-3,3,3-trifluoroacetaldimines with yne nucleophiles

Ziyi Li,
Li Wang,
Yunqi Huang,
Haibo Mei,
Hiroyuki Konno,
Hiroki Moriwaki,
Vadim A. Soloshonok and
Jianlin Han

Beilstein J. Org. Chem. 2020, 16, 2671–2678, doi:10.3762/bjoc.16.217

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Figure 1: Anti-HIV compound containing a trifluoromethylpropargylamine moiety.

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Scheme 1: Literature-known methods (a and b) and the here reported (c) approach for the synthesis of α-triflu...

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Scheme 2: Substrate scope study. Reaction conditions: arylethyne 2 (0.39 mmol), imine 1 (0.3 mmol), LiHMDS (0...

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Figure 2: ORTEP diagram showing of the minor product of 3a.

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Figure 3: Mode of nucleophilic attacks A and B.

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Scheme 3: Large-scale application of the reaction.

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Scheme 4: Removal of the chiral auxiliary.

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Published 29 Oct 2020

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2,3-Dibutoxynaphthalene-based tetralactam macrocycles for recognizing precious metal chloride complexes

Li-Li Wang,
Yi-Kuan Tu,
Huan Yao and
Wei Jiang

Beilstein J. Org. Chem. 2019, 15, 1460–1467, doi:10.3762/bjoc.15.146

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Scheme 1: (a) Chemical structures of the reported tetralactam macrocycles with aromatic sidewalls; (b) synthe...

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Figure 1: ¹H NMR spectra (500 MHz, CDCl3) of a) 1 at 298 K, b) 1 at 223 K, and c) 2 at 298 K.

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Figure 2: Two different views of the X-ray single crystal structure of 1 obtained from its CH₃CN solution.

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Figure 3: Partial ¹H NMR spectra (500 MHz, CDCl₃, 0.5 mM, 298 K) of 1 and the equimolar mixture with TBA[AuCl₄...

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Figure 4: ESI mass spectrum of complex AuCl₄⁻@1.

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Figure 5: Energy-minimized structure of a) AuCl₄⁻@1 and b) AuCl₄⁻@2 at the level of theory of PM3 by using Sp...

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Figure 6: a) Fluorescence emission spectra of 1 (20 µM) upon addition of different amounts of TBA[AuCl₄] (con...

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Published 02 Jul 2019

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Coordination-driven self-assembly vs dynamic covalent chemistry: versatile methods for the synthesis of molecular metallarectangles

Li-Li Ma,
Jia-Qin Han,
Wei-Guo Jia and
Ying-Feng Han

Beilstein J. Org. Chem. 2018, 14, 2027–2034, doi:10.3762/bjoc.14.178

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Scheme 1: Synthesis of half-sandwich rhodium metallarectangles via three different methods. Method A: coordin...

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Figure 1: Partial ¹H NMR spectra (400 MHz, DMSO-d₆, ppm) of (a) L1; (b) the sample of metallarectagle 3a obta...

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Figure 2: Partial ¹H NMR spectra (400 MHz, DMSO-d₆, ppm) of (a) L2; (b) a sample of metallarectangle 3b obtai...

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Figure 3: Calculated (bottom) and experimental (top) ESI-MS spectra of the tetracationic half-sandwich rhodiu...

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Figure 4: Optimized structures of the charged metallarectangles 3a (top) and 3b (bottom), optimized with the ...

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Published 03 Aug 2018

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Supramolecular polymer assembly in aqueous solution arising from cyclodextrin host–guest complexation

Jie Wang,
Zhiqiang Qiu,
Yiming Wang,
Li Li,
Xuhong Guo,
Duc-Truc Pham,
Stephen F. Lincoln and
Robert K. Prud’homme

Beilstein J. Org. Chem. 2016, 12, 50–72, doi:10.3762/bjoc.12.7

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Figure 1: Structures of α-, β- and γ-CD. Individual carbon atom numbering is shown for one D-glucopyranose su...

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Figure 2: Associations of hydrophobic substituents (circled) (a) and their disruption through host–guest comp...

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Figure 3: Decrease of aqueous solution viscosity at a shear rate of 50 s⁻¹ due to α-CD (circles), β-CD (recta...

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Figure 4: The effect of (a) α-CD, (b) β-CD and (c) γ-CD on the hydrophobic interactions between n-C₁₈H₃₇ subs...

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Figure 5: The effect of SDS addition on viscosity shear rate dependence for 2 wt % aqueous PAAodn solutions c...

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Figure 6: Host–guest complexation between polymers with cyclodextrin and hydrophobic substituents.

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Figure 7: Variation of viscosity with mole ratio of CD substituents to hydrophobic substituents on poly(acryl...

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Figure 8: Illustration of the competitive intermolecular host–guest complexation of either the adamantyl subs...

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Figure 9: Competitive host–guest complexations in which either the adamantyl substituent (red) or the n-hexyl...

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Figure 10: (a) Substituted chitosan in which acyl- and adamantyl-substitution is 5% and 12 %, respectively. (b...

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Figure 11: The formation of a AD-PEG micelle followed by the formation of a AD-PEG/α-CD supramolecular hydroge...

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Figure 12: Interaction of PEG-b-PAA block copolymer with cis-diamminedichloroplatinum(II), cisplatin, to form ...

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Figure 13: Solution to hydrogel transitions (a)–(d) for a PAAddn segment in the presence of competitive photo-...

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Figure 14: Structures of the poly(acrylate)-based polymers PAAAzo (trans), PAAAzo (cis), PAA3α-CD and PAA6α-CD...

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Figure 15: Variation of viscosity of a PAA6α-CD/PAAAzo solution (circles) and a PAA3α-CD/PAAAzo solution (tria...

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Figure 16: The structures proposed for the poly(ethylene glycol)-b-poly(ethylamine)-g-dextran·γ-CD, PEG-PEI-de...

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Figure 17: Structure of poly(ethylene glycol) polyrotaxane with adamantyl end substituents, and its temperatur...

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Figure 18: Copolymers of either (a) N,N-dimethylacrylamide (DMAA) or (b) N-isopropylacrylamine (NIPAAM) with 1...

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Figure 19: The copolymer of isopropylacrylamine and methacrylated β-CD (a) and its complexation of the anions ...

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Figure 20: Solution to hydrogel transitions for two segments of PAAddn in the presence of β-CD and change in t...

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Figure 21: Preparation of a β-CD and adamantyl substituted acrylamide polymer hydrogel involving host–guest co...

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Figure 22: Aqueous solutions of the polymers poly-β-CD and poly-α-BrNP form the poly-β-CD/poly-α-BrNP hydrogel ...

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Figure 23: (a) Randomly β-CD substituted poly(acrylate), PAA-6β-CD. (b) Randomly ferrocenyl substituted poly(a...

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Figure 24: (a) The β-CD, adamantyl and ferrocenyl substituted pAAm and pNiPAAM polymers. (b) The β-CD, adamant...

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Review

Published 12 Jan 2016

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