Suzuki交叉偶联和N-芳基化反应的组合合成4-芳基,2,4-二芳基和2,4,7-三芳基吡咯并[2,3- d ]嘧啶
摘要:
一种简单而又容易的合成新型4-芳基-2-氯-,2,4-二芳基-和2,4,7-三芳基吡咯并[2,3- d ]嘧啶的杂环骨架,其中的芳基和杂芳基是通过描述了2,4-二氯吡咯并[2,3- d ]嘧啶与芳基硼酸和卤代芳烃的Suzuki交叉偶联和N-芳基化反应的组合。发现大多数合成化合物在近紫外-蓝色光谱范围内发射,荧光量子产率高达67%。讨论了连接到吡咯并嘧啶衍生物的吡咯环上的芳基对光学性能的影响。
Fused Pyrrolo[2,3-d]pyrimidines (7-Deazapurines) by Palladium-Catalyzed Direct N–H and C–H Arylation Reactions
作者:Jelena Dodonova、Sigitas Tumkevicius
DOI:10.1055/s-0036-1588734
日期:2017.6
hitherto unknown fused hetero systems containing an incorporated pyrrolo[2,3-d]pyrimidine scaffold are described. Pyrimido[5′,4′:4,5]pyrrolo[2,1-a]isoindoles were synthesized from 2,4-diarylpyrrolo[2,3-d]pyrimidines and o-bromobenzyl bromides by using a cascade N-benzylation/C–H arylation reaction sequence. A series of pyrimido[5′,4′:4,5]pyrrolo[1,2-f]phenanthridines were successfully assembled via a domino
描述了钯催化的分子内直接 C-H 芳基化,用于合成迄今为止未知的稠合异质系统,其中包含并入的吡咯并[2,3- d ]嘧啶支架。嘧啶并[5',4':4,5]吡咯并[2,1- a ]异吲哚是由2,4-二芳基吡咯并[2,3- d ]嘧啶和邻溴苄基溴通过级联N-苄基化合成/ C-H 芳基化反应序列。通过多米诺骨牌过程成功组装了一系列嘧啶并[5',4':4,5]吡咯并[1,2- f ]菲啶,涉及钯催化的2,4,7-直接双C-H芳基化反应三芳基吡咯并[2,3- d ]嘧啶与邻溴碘苯。
Optical study of the formation of pyrrolo[2,3-d]pyrimidine-based fluorescent nanoaggregates
Pyrrolo[2,3-d]pyrimidine derivatives possessing different sterically-hindered end-groups at position 7 of the heterocycle were studied and compared with respect to nanoaggregate formation ability by the reprecipitation method in aqueous solutions. The emergence of nanoaggregates with an increasing water fraction in THF/water mixture was traced by observing sudden changes in spectral and transient fluorescence
palladium-catalyzed Suzuki–Miyaura reaction of 2,4-dichloropyrrolo[2,3-d]pyrimidine with aryl boronic acids has been studied. Pd(OAc)2/dicyclohexyl(2-biphenyl)phosphine/K3PO4 was found to be an efficient catalyst system to prepare 4-aryl-2-chloro- and 2,4-diarylpyrrolo[2,3-d]pyrimidines. Novel non-linear molecules consisting of a pyrrolo[2,3-d]pyrimidinecore and aryl branches have been elucidated as blue light-emitters
研究了钯催化的2,4-二氯吡咯并[2,3- d ]嘧啶与芳基硼酸的Suzuki-Miyaura反应。发现Pd(OAc)2 /二环己基(2-联苯基)膦/ K 3 PO 4是制备4-芳基-2-氯-和2,4-二芳基吡咯并[2,3- d ]嘧啶的有效催化剂体系。。由吡咯并[2,3- d ]嘧啶核和芳基支链组成的新型非线性分子已被阐明为蓝光发射体,在THF溶液中的荧光量子产率为4%至67%。讨论了连接到吡咯并嘧啶衍生物的吡咯环上的吸电子t - BuOCO基团对光学性能的影响。