A method for preparing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton has been developed using domino intermolecular and intramolecular S2 cyclization. Using this method, the formation of pyrrolidine proceeded smoothly with good yield without the E2 elimination product. This reaction condition is effective for synthesizing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton.
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http://dx.doi.org/10.1248/cpb.c24-00783 | DOI Listing |
Chem Pharm Bull (Tokyo)
January 2025
Graduate School of Integrated Basic Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan.
A method for preparing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton has been developed using domino intermolecular and intramolecular S2 cyclization. Using this method, the formation of pyrrolidine proceeded smoothly with good yield without the E2 elimination product. This reaction condition is effective for synthesizing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton.
View Article and Find Full Text PDFActa Crystallogr E Crystallogr Commun
January 2025
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522, Japan.
The title compounds, CHO ( and ), are tetra-cyclic benzoates composed of a taxane ring with a fused dioxolane ring as the core skeleton. In compound , the five-membered dioxolane ring is essentially planar while the two cyclo-hexane rings and the cyclo-octane ring adopt chair and chair-chair forms, respectively, and there are three intra-molecular H⋯H short contacts. The corresponding ring conformations in are similar; however, one intra-molecular C-H⋯O inter-action and two H⋯H short contacts are observed, and the benzoyl and meth-oxy-methyl groups show orientational disorder.
View Article and Find Full Text PDFInt J Biol Macromol
February 2025
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China. Electronic address:
The multi-enzyme assembly system demonstrates remarkable potential in enhancing both intracellular and extracellular enzyme catalysis. In this study, we employed a novel icosahedral protein cage, Mi3, as a protein scaffold and combined it with an ester bond-based peptide tagging system, ReverseTag/ReverseCatcher, to improve the enzymatic catalytic efficiency both in vitro and in vivo. In vitro, we fused ReverseTag to the N-terminal of exo-inulinase (EXINU) from Pseudomonas mucidolens, yielding ReverseTag-EXINU, which effectively bound to the surface of the ReverseCatcher-Mi3 protein cage.
View Article and Find Full Text PDFJ Org Chem
December 2024
Department of Applied Chemistry, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea.
In this study, 5-(2-bromoaryl)tetrazoles were reacted with 1,3-diketones in DMF in the presence of a catalytic amount of magnetic Cu-MOF-74 (FeO@SiO@Cu-MOF-74) and a base under microwave irradiation to yield the corresponding 1-aminoisoquinolines. The FeO@SiO@Cu-MOF-74 catalyst could be easily recovered from the reaction mixture and reused four times without any significant loss of catalytic activity. An initial copper-catalyzed C(sp)-C(sp) bond formation accompanied by -Claisen deacylative cyclocondensation (for acyclic 1,3-diketones) and direct cyclocondensation (for cyclohexane-1,3-diones) is proposed as a key reaction pathway for this process.
View Article and Find Full Text PDFFood Chem
December 2024
College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China. Electronic address:
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