炔二酰胺(双 N 取代的炔烃)是氮杂环的宝贵前体。在这里,我们报告了炔基-炔二酰胺的环异构化/1,2-磺酰基迁移以形成四氢吡咯并吡咯,这是前所未有的与药物化学相关的杂环支架。这种耐受官能团的转化可以使用在环境温度下进行的 Au(I) 催化和热促进过程来实现。通过一系列反应来使稠合吡咯核功能化,证明了这些产品的实用性。
undergo [2+2+2] cyclotrimerization with nitriles in the presence of a catalytic amount of the ruthenium complex Cp*RuCl(cod) (10 mol%) to afford the corresponding halopyridines under ambient conditions in good isolated yields (up to 90%). The halopyridines are formed as two separable regioisomers. This is the first example of a direct synthesis of halopyridines from haloalkynes and nitriles.
A regio- and stereoselective entry to (Z)-β-halo alkenyl sulfides and their applications to access stereodefined trisubstituted alkenes
作者:Ge Liu、Lichun Kong、Ji Shen、Gangguo Zhu
DOI:10.1039/c4ob00103f
日期:——
sulfides in high yields with excellent regio- and stereoselectivity. This approach covers a variety of substrates, including both aryl and alkyl haloalkynes. Meaningfully, it allows a facile access to stereodefined (Z)- or (E)-trisubstituted olefins featuring the iterative cross-coupling of carbon–halide and carbon–sulfur bonds of β-halo alkenyl sulfides.
已经实现了通过K 2 CO 3促进卤代炔烃的氢硫醇化来温和有效地制备(Z)-β-卤代烯基硫化物,在高浓度下生产(Z)-β-溴和(Z)-β-氯代乙烯基硫化物。产生具有优异的区域和立体选择性的产物。该方法涵盖了多种底物,包括芳基和烷基卤代炔烃。有意义的是,它允许轻松访问立体定义的(Z)或(E)三取代的烯烃,其特征在于β-卤代烯基硫醚的卤化碳和碳硫键具有迭代交叉偶联。