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Llamosí, Arturo; Danylyuk, Oksana; Szumna, Agnieszka, 2024, "Facile and Versatile Mechanochemical Synthesis of Indigoid Photoswitches", https://doi.org/10.18150/RM0X9S, RepOD, V1
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We demonstrate the application of mechanochemistry in the synthesis of indolone-based photoswitches (hemiindigos, hemithioindigos, and oxindoles) via Knoevenagel condensation reactions. Utilizing ball-milling and an organic base (piperidine) acting as catalyst and solvent for liquid assisted grinding (LAG) conditions, we achieve rapid, solvent-free transformations, obtaining a set of known and previously unreported photoswitches, including highly functional amino acid–based photoswitches, multichromophoric derivatives and photoswitchable cavitands based on resorcin[4]arenes. The reaction under mechanochemical conditions gives moderate-to-high yields and is highly stereoselective leading to Z-isomers of hemiindigos and hemithioindigos and E-isomers of oxindoles. For selected examples, reversible visible-light photoswiching properties have been demonstrated.
Hemiindigo, Hemithioindigo, Oxindole, Mechanochemistry, Photoswitch
CC BY - Creative Commons Attribution 4.0
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