2020
DOI: 10.1002/anie.201916732
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Supramolecular Photocatalysis by Utilizing the Host–Guest Charge‐Transfer Interaction: Visible‐Light‐Induced Generation of Triplet Anthracenes for [4+2] Cycloaddition Reactions

Abstract: Supramolecular photocatalysis via charge-transfer excitation of a host-guest complex was developed by use of the macrocyclic boronic ester [2+2] BTH-F containing highly electron-deficient difluorobenzothiadiazole moieties. In the presence of a catalytic amount of [2+2] BTH-F , the triplet excited state of anthracene was generated from the charge-transfer excited state of anthracene@[2+2] BTH-F by visible-light irradiation, and cycloaddition of the excited anthracene with several dienes and alkenes proceeded in… Show more

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Cited by 38 publications
(34 citation statements)
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“…Numerous examples for receptors with optical read‐out, photoswitchable self‐assemblies and light‐controlled molecular machines have been reported [3] . Recently, photo‐redox chemistry started to take advantage of the supramolecular organization of organic or metal‐based chromophores into functional systems, for example, for catalytic oxidation of alcohols [4] or cycloadditions to anthracenes [5] . Dye‐based assemblies have further been studied for bio‐imaging [6] and medicinal applications such as photodynamic therapy [7]…”
Section: Figurementioning
confidence: 99%
“…Numerous examples for receptors with optical read‐out, photoswitchable self‐assemblies and light‐controlled molecular machines have been reported [3] . Recently, photo‐redox chemistry started to take advantage of the supramolecular organization of organic or metal‐based chromophores into functional systems, for example, for catalytic oxidation of alcohols [4] or cycloadditions to anthracenes [5] . Dye‐based assemblies have further been studied for bio‐imaging [6] and medicinal applications such as photodynamic therapy [7]…”
Section: Figurementioning
confidence: 99%
“…On the other hand, the host-guest complex benefits from the well-defined structure, considerable solubility and adequate dynamicity to ensure the contact of the triplet state guest with other reactants, thus facilitating energy transfer and electron transfer. [41][42][43][44][45][46][47][48][49][50][51][52][53][54] To this end, N,Ndimethyl 2,5-bis(4-pyridinium)thiazolo [5,4-d]thiazole diiodide (MPT), an efficient fluorochrome with acceptor-donoracceptor structure, was designed. [55] As shown in Scheme 1, it self-assembled into supramolecular dimer in the cavity of cucurbit [8]uril (CB [8]) in a parallel and staggered conformation.…”
mentioning
confidence: 99%
“…In 2020, an elegant supramolecular photocatalytic system via charge-transfer excitation of a host-guest complex was described by Iwasawa's group for the [4 + 2] cycloaddition reaction of anthracenes 91. [68] In particular, this supramolecular system which includes as host the macrocyclic boronic ester [2 + 2]BTH-F decorated with electron-deficient difluorobenzothiazole moieties, can generate the triplet state of guest molecule and thus, promoting the photocycloaddition of anthracenes with several dienes and alkenes in high yields. In detail, DFT calculations suggest that under visible light irradiation, the anthracene@[2 + 2]BTH-F complex undergoes charge-transfer excitation to induce a charge-separated singlet state (Scheme 52).…”
Section: [4 + 2] Cycloaddition Crafting Six Membered Ringsmentioning
confidence: 99%