发现一种新的MOP配体(1b)(R)-(+)-2-(双(3-三氟甲基苯基)膦基)-2'-甲氧基-1,1'-联萘基比其他MOP配体对映选择性更高用甲酸催化钯催化α,α-二取代的烯丙基酯的不对称还原。还原苯甲酸dl-2-(1-萘基)-3-丁烯-2-基酯得到90%ee的3-(1-萘基)-1-丁烯。的对映体选择性高1B是归因于快速顺-反通过氧化加成烯丙基酯与钯(0)物种形成π烯丙基钯中间体的异构化。的速率顺-反异构化是通过在磁化饱和转移测定11 H NMR。
本文介绍了使用铜和钯试剂的可调和立体选择性双催化系统。这种甲硅烷基化和钯催化的烯丙基化反应可轻松获得三取代的链烯基硅烷。对反应条件进行微调,可以选择性地使用一种立体异构体。这种新方法可耐受两个偶联配偶体上的不同取代基,并具有很高的立体选择性。一锅反应涉及Cu I / Pd 0协同双催化剂,直接满足了开发更多时间效率和更少浪费的合成途径的需求。
A direct approach to amines with remote stereocentres by enantioselective CuH-catalysed reductive relay hydroamination
作者:Shaolin Zhu、Nootaree Niljianskul、Stephen L. Buchwald
DOI:10.1038/nchem.2418
日期:2016.2
elements in many pharmaceutical agents and natural products. However, previously reported methods to prepare these compounds in an enantioselective manner are indirect and require multistep synthesis. Here, we report a copper-hydride-catalysed, enantioselectivesynthesis of γ- or δ-chiral amines from readily available allylic alcohols, esters and ethers using a reductive relay hydroamination strategy (a
Labeling and Natural Post-Translational Modification of Peptides and Proteins via Chemoselective Pd-Catalyzed Prenylation of Cysteine
作者:Thomas Schlatzer、Julia Kriegesmann、Hilmar Schröder、Melanie Trobe、Christian Lembacher-Fadum、Simone Santner、Alexander V. Kravchuk、Christian F. W. Becker、Rolf Breinbauer
DOI:10.1021/jacs.9b08279
日期:2019.9.18
The prenylation of peptides and proteins is an important post-translational modification observed in vivo. We report that the Pd-catalyzed Tsuji–Trost allylation with a Pd/BIPHEPHOS catalyst system allows the allylation of Cys-containing peptides and proteins with complete chemoselectivity and high n/i regioselectivity. In contrast to recently established methods, which use non-native connections,
Ï-Allylic azidation of allyl esters was performed with an amphiphilic polystyrene-poly(ethylene glycol) (PS-PEG) resin-supported phosphine-palladium complex in water under heterogeneous conditions to give allyl azides in good to high yields. The polymeric palladium catalyst can be readily recovered and recycled.
Sustainable Palladium-Catalyzed Tsuji–Trost Reactions Enabled by Aqueous Micellar Catalysis
作者:Nicholas R. Lee、Farbod A. Moghadam、Felipe C. Braga、Daniel J. Lippincott、Bingchun Zhu、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1021/acs.orglett.0c01329
日期:2020.7.2
reactions, can be run under micellarcatalysis conditions featuring not only chemistry in water but also numerous combinations of reaction partners that require low levels of palladium, typically on the order of 1000 ppm (0.1 mol %). These couplings are further characterized by especially mild conditions, leading to a number of cases not previously reported in an aqueous micellar medium. Inclusion of diverse
Palladium-catalyzed Substitution Reaction of Allylic Derivatives with Tinacetylene
作者:Toshio NISHIKAWA、Minoru ISOBE
DOI:10.1271/bbb.63.238
日期:1999.1
The substitution reaction of allylic derivatives (acetate, carbonate, and chloride) with tinacetylene proceeded in the presence of palladium as a catalyst to give a product having a 1-ene-4-yne system.