The nickel‐catalyzed borylation of aryl2‐pyridyl ethers via the loss of a 2‐pyridyloxy group is described. This method allows a 2‐pyridyloxy group to be used as a convertible directing group in C−H bond functionalization reactions. The nickel catalyst can also borylate arylmethyl 2‐pyridyl ethers, in which the stereochemistry at the benzylic position is retained in the case of chiral secondary benzylic
Rhodium(III)-Catalyzed <i>ortho</i>-Alkylation of Phenoxy Substrates with Diazo Compounds via C–H Activation: A Case of Decarboxylative Pyrimidine/Pyridine Migratory Cyclization Rather than Removal of Pyrimidine/Pyridine Directing Group
作者:Manjula Ravi、Srinivasarao Allu、K. C. Kumara Swamy
DOI:10.1021/acs.joc.6b02693
日期:2017.3.3
possessing the ester functionality undergo decarboxylative pyrimidine/pyridine migratory cyclization (rather than deprotection of pyrimidine/pyridine group) using 20% NaOEt in EtOH affording a novel class of 3-(pyrimidin-2(1H)-ylidene)benzofuran-2(3H)-ones and 6-methyl-3-(pyridin-2(1H)-ylidene)benzofuran-2(3H)-one. The ortho-alkylated phenoxypyridine possessing ester functionality also undergoes decarboxylative
modification, the authors discovered a new polymeric Cu-complex that contains μ3-CO3 bridges. The polymeric linear structure of the complex was established using single crystalX-ray analysis. FT-IR, UV-vis and DSC studies were also performed on the polymeric complex. This novel polymeric Cu-complex was found to efficiently catalyse C–O/C–S cross coupling reactions between chloropyrimidines and phenols/thiophenols
该手稿报道了新型聚合物铜络合物 ([Cu 3 (DMAP) 8 (μ 3 -CO 3 ) 2 ]I 2 ) n · x H 2 O 的合成和表征及其在 C-O 和 C 中的成功应用-S 交叉偶联反应用于合成具有生物学意义的重要苯氧基嘧啶和芳硫嘧啶支架。尝试采用Roy等人报道的方法合成[Cu(DMAP) 4 I]I。经过轻微修改,作者发现了一种包含 μ 3 -CO 3桥的新聚合铜络合物。使用单晶 X 射线分析建立了复合物的聚合线性结构。还对聚合物复合物进行了 FT-IR、UV-vis 和 DSC 研究。这种新型聚合铜配合物被发现可以在短时间内有效催化水性介质中氯嘧啶和苯酚/硫酚之间的C-O/C-S交叉偶联反应,产生相应的苯氧基嘧啶和芳硫嘧啶。使用该方案,成功合成了 22 个苯氧基嘧啶和 6 个芳硫嘧啶。使用1 H 和13 C NMR 光谱和 HRMS 分析对合成的新型化合物进行了很好的表征,并使用