Palladium-Catalyzed Cross-Coupling of 4-Tosyloxyquinazolines with Organoindium Reagents: An Efficient Route to 4-Substituted Quinazolines
作者:Yiyuan Peng、Xinglin Ye、Jianjun Yuan、Yirong Zhou、Zhihong Deng、Xuechun Mao
DOI:10.1055/s-0035-1562504
日期:——
of 4-functionalized quinazolines in good to excellent yields. Higher yields were obtained by the one-pot reaction of quinazolinone, p-methylbenzenesulfonyl chloride, Pd2(dba)3-/(2-furyl)3P, and organoindium reagent. These methods using organoindium compounds as coupling partners provided an efficient route to 4-(hetero)aryl/alkylquinazolines, especially 4-substituted quinazolines bearing a halogen scaffold
摘要 描述了在温和条件下通过喹唑啉酮的芳基化或烷基化制备4-取代的喹唑啉的有效途径。在K 2 CO 3存在下,通过喹唑啉酮类与对甲基苯磺酰氯的反应获得了4-甲苯磺酰喹唑啉。在Pd 2(dba)3 /(2-呋喃基)3 P的催化下,在四氢呋喃中进行的4-甲苯磺酰氧基喹唑啉与有机铟试剂的交叉偶联反应导致形成4-官能化的喹唑啉,收率好至极佳。通过一锅反应喹唑啉酮,对甲基苯磺酰氯,Pd 2(dba)3获得更高的收率-/(2-呋喃基)3 P和有机铟试剂。这些使用有机铟化合物作为偶联伙伴的方法为制备4-(杂)芳基/烷基喹唑啉,特别是带有卤素骨架的4-取代喹唑啉提供了一条有效途径。 描述了在温和条件下通过喹唑啉酮的芳基化或烷基化制备4-取代的喹唑啉的有效途径。在K 2 CO 3存在下,通过喹唑啉酮类与对甲基苯磺酰氯的反应获得了4-甲苯磺酰喹唑啉。在Pd 2(dba)3 /(2-呋喃基)3 P的催化下,在四
Palladium-catalyzed reactions of acetoxyenynes with triorganoindium reagents
作者:John T. Metza、Raffi A. Terzian、Thomas Minehan
DOI:10.1016/j.tetlet.2006.10.043
日期:2006.12
reaction of 1-acetoxy-2,7- and 2,8-enynes with triorganoindium reagents in the presence of 5 mol % palladium catalyst provides cyclic and/or acyclic substitution products depending uponsubstrate structure. Enynes bearing secondary acetates, quaternary centers, or heteroatoms furnish high yields of carbocyclic or heterocyclic substitution products. NMR studies show that a single trisubstituted alkene
General Approach to the Coupling of Organoindium Reagents with Imines via Copper Catalysis
作者:Daniel A. Black、Bruce A. Arndtsen
DOI:10.1021/ol060277p
日期:2006.5.1
A copper-catalyzed three-component coupling of organoindium reagents with imines and acid chlorides is described. This mild carbon-carbon bond forming reaction requires only one-third of an equivalent of indium reagent to proceed in high yield, with the sole byproduct being indium trichloride. The reaction demonstrates broad generality, with aryl-, heteroaryl-, vinyl-, and alkylindiums, as well as functionalized imines and acid chlorides, all providing alpha-substituted amides or N-protected amines in a single step.
A Sequential Indium-Mediated Aldehyde Allylation/Palladium-Catalyzed Cross-Coupling Reaction in the Synthesis of 2-Deoxy-β-<i>C</i>-Aryl Glycosides
作者:John Alec Moral、Seong-Jin Moon、Samuel Rodriguez-Torres、Thomas G. Minehan
DOI:10.1021/ol901353f
日期:2009.8.20
Indium-mediated allylation of aldehydes with 2-chloro-3-iodopropene, followed by a palladium-catalyzed cross-coupling reaction with triarylindium reagents or arylboronic acids, leads to aryl-substituted homoallylic alcohols in good to excellent yields and diastereoselectivities. The products obtained from reactions conducted with D-glyceraldehyde acetonide can be transformed into 2-deoxy-beta-C-aryl ribofuranosides in high overall yields. Similarly, 2-deoxy-beta-C-aryl allopyranosides may be prepared efficiently from 2,4-O-benzylidene erythrose.
Synthesis of C-aryl-Δ2,3-glycopyranosides via uncatalyzed addition of triarylindium reagents to glycals
2,3-Unsaturated-C-aryl glycopyranosides are important intermediates in the synthesis of medicinally important C-aryl glycosides. Treatment of glycal acetates with triarylindiums in ether at room temperature gives good yields of C-aryl-Delta(2,3)-glycosides of predominantly alpha-configuration. The mechanism of this reaction likely involves the formation of an oxocarbenium ion intermediate via indium(III) Lewis acid-assisted ionization of the glycal C.3 acetate. Coupling of trivinyl- and tris(alkynyl)indiums with glycals similarly led to C-vinyl- and Galkynyl-Delta(2,3)-glycosides in good yield. (C) 2004 Elsevier Ltd. All rights reserved.