Rhodium-Catalyzed Intra- and Intermolecular [5 + 2] Cycloaddition of 3-Acyloxy-1,4-enyne and Alkyne with Concomitant 1,2-Acyloxy Migration
作者:Xing-Zhong Shu、Xiaoxun Li、Dongxu Shu、Suyu Huang、Casi M. Schienebeck、Xin Zhou、Patrick J. Robichaux、Weiping Tang
DOI:10.1021/ja2109097
日期:2012.3.21
type of rhodium-catalyzed [5 + 2] cycloaddition was developed for the synthesis of seven-membered rings with diverse functionalities. The ring formation was accompanied by a 1,2-acyloxy migration event. The five- and two-carbon components of the cycloaddition are 3-acyloxy-1,4-enynes (ACEs) and alkynes, respectively. Cationic rhodium(I) catalysts worked most efficiently for the intramolecular cycloaddition
Synthesis of Highly Substituted Furans by a Cascade of Formal <i>anti</i>-Carbopalladation/Hydroxylation and Elimination
作者:Theresa Schitter、Naveen J. Roy、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.orglett.8b03732
日期:2019.2.1
substituted furans are generated by a cascade of formal anti-carbopalladation, attack of a nucleophilic hydroxy group, and aromatization by elimination of the emerging dihydrofuran derivative. Mono-, di-, and trisubstituted furans were obtained in good to excellent yields. When we attempted to access tetrasubstituted furan derivatives, an additional rearrangement was observed that resulted in the formation
Sugar‐Based Polymers from
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‐Xylose: Living Cascade Polymerization, Tunable Degradation, and Small Molecule Release
作者:Antonio Rizzo、Gregory I. Peterson、Atanu Bhaumik、Cheol Kang、Tae‐Lim Choi
DOI:10.1002/anie.202012544
日期:2021.1.11
change the degradation profile of the polymer and the identity of the resulting degradation products. For instance, the large difference in degradation rates between hemi‐aminal ether and ether‐based polymers enabled the sequential degradation of a block copolymer. Furthermore, we exploited the generation of furan‐based degradation products, from an acetal‐based polymer, to achieve the release of covalently
Total Synthesis of (±)-Pentalenolactone A Methyl Ester
作者:Qi Liu、Guozong Yue、Na Wu、Guang Lin、Yuanzhen Li、Junmin Quan、Chuang-chuang Li、Guoxin Wang、Zhen Yang
DOI:10.1002/anie.201206705
日期:2012.11.26
pentalenolactone A has been obtained through the stereoselective synthesis of a cyclopentenone by a combination of the Co‐mediated Pauson–Khand reaction (PKR) of enyne 1, and the construction of a quaternary‐carbon‐based strained α‐methylidene‐δ‐pentyrolactone core through a trimethylsilyl (TMS) mediated, telescopedintramolecularMichaelolefination (TIMO) reaction of keto‐phosphonate 2.