Described here is the de novo design and synthesis of a series of 6H-dipyrido[1,2-e:2′,1′-i]purin-6-ones (DPs) as a new class of visible-light photoredox catalysts (PCs). The synthesized DP1–5 showed their λ_Abs(max) values in 433–477 nm, excited state redox potentials in 1.15–0.69 eV and −1.41 to −1.77 eV (vs. SCE), respectively. As a representative, DP4 enables the productive guanylation of various amines, including 1°, 2°, and 3°-alkyl primary amines, secondary amines, aryl and heteroaryl amines, amino-nitrile, amino acids and peptides as well as propynylamines and α-amino esters giving diversities in biologically important guanidines and cyclic guanidines. The photocatalytic efficacy of DP4 in the guanylation overmatched commonly used Ir and Ru polypyridyl complexes, and some organic PCs. Other salient merits of this method include broad substrate scope and functional group tolerance, gram-scale synthesis, and versatile late-stage derivatizations that led to a derivative 81 exhibiting 60-fold better anticancer activity against Ramos cells with the IC₅₀ of 0.086 μM than that of clinical drug ibrutinib (5.1 μM).

中文翻译：

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从头设计和合成双吡啶并嘌呤酮衍生物作为生产性鸟苷化反应中的可见光光催化剂

本文描述了一系列 6 H-联吡啶并[1,2- e :2',1'- i ]purin-6-ones (DPs) 作为新型可见光光氧化还原催化剂的从头设计和合成（件）。合成的DP1-5的λ _Abs(max)值分别在 433-477 nm，激发态氧化还原电位分别在 1.15-0.69 eV 和 -1.41 到 -1.77 eV（相对于SCE）。作为代表，DP4能够对各种胺进行有效的鸟苷化，包括 1°、2° 和 3°-烷基伯胺、仲胺、芳基和杂芳基胺、氨基腈、氨基酸和肽以及丙炔胺和 α-氨基酯，从而产生多样性在生物学上重要的胍和环状胍中。DP4在鸟苷酸化反应中的光催化功效超过了常用的 Ir 和 Ru 多吡啶基配合物，以及一些有机 PC。该方法的其他显着优点包括广泛的底物范围和官能团耐受性、克级合成和通用的后期衍生化，导致衍生物81对具有 IC ₅₀的拉莫斯细胞表现出 60 倍更好的抗癌活性 比临床药物依鲁替尼 (5.1 μM) 低 0.086 μM。