Aqueous and Visible-Light-Promoted C–H (Hetero)arylation of Uracil Derivatives with Diazoniums
作者:An-Di Liu、Zhao-Li Wang、Li Liu、Liang Cheng
DOI:10.1021/acs.joc.1c01799
日期:2021.12.3
Direct C5 (hetero)arylation of uracil and uridine substrates with (hetero)aryl diazoniumsalts under photoredox catalysis with blue light was reported. The coupling proceeds efficiently with diazoniumsalts and heterocycles in good functional group tolerance at room temperature in aqueous solution without transition-metal components. A plausible radical mechanism has been proposed.
Efficient One-Step Suzuki Arylation of Unprotected Halonucleosides, Using Water-Soluble Palladium Catalysts
作者:Elizabeth C. Western、Jonathan R. Daft、Edward M. Johnson、Peter M. Gannett、Kevin H. Shaughnessy
DOI:10.1021/jo034289p
日期:2003.8.1
modification of unprotectedhalonucleosides is reported herein. Using a catalyst derived from tris(3-sulfonatophenyl)phosphine (TPPTS) and palladium acetate, 8-bromo-2'-deoxyguanosine (8-BrdG) is coupled with arylboronic acids to give 8-aryl-2'-deoxyguanosine adducts (8-ArdG) in excellent yield in a 2:1 water:acetonitrile solvent mixture. The TPPTS ligand was found to be superior to water-soluble alkylphosphines
New water soluble Pd-imidate complexes as highly efficient catalysts for the synthesis of C5-arylated pyrimidine nucleosides
作者:Anant Kapdi、Vijay Gayakhe、Yogesh S. Sanghvi、Joaquín García、Pedro Lozano、Ivan da Silva、José Pérez、J. Luis Serrano
DOI:10.1039/c4ra01326c
日期:——
Recyclable water-soluble Pd complexes were revealed as excellent catalysts for Suzuki–Miyaura cross-coupling of challenging substrates like the antiviral nucleoside analogue 5-iodo-20-deoxyuridine.
Quadrol-Pd(<scp>ii</scp>) complexes: phosphine-free precatalysts for the room-temperature Suzuki–Miyaura synthesis of nucleoside analogues in aqueous media
作者:José Luis Serrano、Sujeet Gaware、Jose Antonio Pérez、José Pérez、Pedro Lozano、Santosh Kori、Rambabu Dandela、Yogesh S. Sanghvi、Anant R. Kapdi
DOI:10.1039/d1dt03778a
日期:——
Commercially available Quadrol, N,N,N′,N′-tetrakis(2-hydroxypropyl)ethylenediamine (THPEN), has been used for the first time as a N^N-donor neutral hydrophilic ligand in the synthesis and characterization of new water soluble palladium(II) complexes containing chloride, phthalimidate or saccharinate as co-ligands. [PdCl2(THPEN)] (1) [Pd(phthal)2(THPEN)] (2), [Pd(sacc)2(THPEN)] (3) and the analogous complex
市售Quadrol, N , N , N ', N '-四(2-羟丙基)乙二胺(THPEN),首次被用作N^N-供体中性亲水配体用于新水的合成和表征含有氯化物、邻苯二甲酰亚胺酸盐或糖精酸盐作为共配体的可溶性钯( II )络合物。 [PdCl 2 (THPEN)] ( 1 ) [Pd(酞) 2 (THPEN)] ( 2 ), [Pd(sacc) 2 (THPEN)] ( 3 ) 以及与密切相关的N , N , N的类似配合物', N '-四(2-羟乙基)乙二胺 (THEEN) [Pd(sacc) 2 (THEEN)] ( 4 ) 通过一锅反应由 [PdCl 2 (CH 3 CN) 2 ] 或 Pd 有效制备(OAc) 2 。通过单晶 X 射线衍射对1和3进行结构表征,产生了迄今为止报道的第一个钯与 Quadrol 配合物的结构。所得的钯配合物在水中高度溶解,并且被发现可作为无膦催化剂,在室温
Analogues of uracil nucleosides with intrinsic fluorescence (NIF-analogues): synthesis and photophysical properties
作者:Meirav Segal、Bilha Fischer
DOI:10.1039/c1ob06536j
日期:——
were obtained from 5-I-uridine and the suitable boronic acid in a Sonogashira coupling reaction. The uracil fluorescent analogues proposed here were designed to satisfy the following requirements: a minimal chemical modification at a position not involved in base-pairing, resulting in relatively long absorption and emission wavelengths and highquantumyield. 5-((4-Methoxy-phenyl)-trans-vinyl)-2′-deoxy-uridine