Synthesis of High Enantiopurity N-Protected α-Amino Ketones by Thiol Ester−Organostannane Cross-Coupling Using pH-Neutral Conditions
作者:Hao Li、Hao Yang、Lanny S. Liebeskind
DOI:10.1021/ol8018456
日期:2008.10.2
efficient synthesis of high enantiopurity N-protected alpha-amino ketones is described. Complementing other studies using boronic acids and thiol esters, this Cu(I) diphenylphosphinate (CuDPP)-mediated, palladium-catalyzed coupling of alpha-amino thiol esters with aryl, heteroaryl, allyl, and alkenyl organostannanes gives N-protected alpha-amino ketones in high yields with high enantiopurity (in almost
描述了高对映纯度 N 保护的 α-氨基酮的有效合成。作为使用硼酸和硫羟酸酯的其他研究的补充,这种二苯基次膦酸铜 (CuDPP) 介导的钯催化的 α-氨基硫羟酸酯与芳基、杂芳基、烯丙基和烯基有机锡烷的偶联得到 N-保护的 α-氨基酮在温和和 pH 中性的反应条件下以高产率和高对映体纯度(几乎在所有情况下)。与相关的硼酸系统相比,缺乏 pi 的杂芳基锡烷的生存能力是该反应的一个优势。
Tin for Organic Synthesis, 14. Synthesis of Aromatic and α,β‐Unsaturated Aldehydes by a Friedel‐Crafts‐like Electrophilic Destannylation Using 1,1‐Dichloromethyl Methyl Ether
作者:Michael Niestroj、Wilhelm P. Neumann†
DOI:10.1002/cber.19961290111
日期:1996.1
for the preparation of a variety of aromatic (7a–m), heteroaromatic (7n–r), and α,β-unsaturated aldehydes (8a–f) is described. The reaction of trialkylaryl- (2a–o), heteroaryl- (2p–t), and 1-alkenylstannanes (4a–f and 5a–f) with dichloromethylmethylether (1, DCME) in the presence of aluminium trichloride followed by hydrolysis provides the corresponding aldehydes. In the case of arylstannanes the ipso-isomers
Isoflavones were synthesized from the reaction of 3‐bromochromone derivatives and aryltributylstannanes via Stillecoupling catalyzed by a water‐soluble and reusable PdCl2(NH3)2/2,2′‐cationic bipyridyl system in aqueous solution. For prototype 3‐bromochromone, the coupling reaction was performed at 80°C for 24 hr with 2.5 mol% catalyst in water in the presence of tetrabutylammonium fluoride. After
A Practical Synthesis of Biaryls and Aromatic Acetylenes by Stille Coupling in Room-Temperature Ionic Liquids
作者:Wenyan Hao、Zhiwen Xi、Mingzhong Cai
DOI:10.1080/00397911.2011.558233
日期:2012.8.15
cross-coupling reactions of aryl halides with aryl or alkynylstannanes have been achieved under mild conditions in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), affording the corresponding biaryls and aromatic acetylenes in good yields. Use of this solvent allows for facile recycling of the solvent and catalyst system, which can be used at least five times without loss of activity. GRAPHICAL
MCM-41-supported bidentate phosphine palladium(0) complex as an efficient catalyst for the heterogeneous Stille reaction
作者:Hong Zhao、Yue Wang、Junchao Sha、Shouri Sheng、Mingzhong Cai
DOI:10.1016/j.tet.2008.05.120
日期:2008.8
Stille coupling reaction of organostannanes with organic halides has been developed in the presence of a catalytic amount of MCM-41-supportedbidentatephosphine palladium(0) complex (0.5 mol %) in DMF/H2O (9:1) under air atmosphere in high yields. This polymeric palladium catalyst exhibits higher activity than Pd(PPh3)4 and can be reused at least 10 times without any decrease in activity.
在空气中DMF / H 2 O(9:1)中催化量的MCM-41负载的双齿膦膦钯(0)络合物(0.5 mol%)的存在下,开发了有机锡与有机卤化物的Stille偶联反应。高产的气氛。该聚合钯催化剂显示出比Pd(PPh 3)4更高的活性,并且可以重复使用至少10次而活性没有降低。