Catalytic Enantioselective Allylic Amination of Unactivated Terminal Olefins via an Ene Reaction/[2,3]-Rearrangement
作者:Hongli Bao、Uttam K. Tambar
DOI:10.1021/ja307851b
日期:2012.11.14
The enantioselective allylic amination of unactivated terminal olefins represents a direct and attractive strategy for the synthesis of enantioenriched amines. We have developed the first use of a nitrogen-containing reagent and a chiral palladium catalyst to convert unfunctionalized olefins into enantioenriched allylic amines via an ene reaction/[2,3]-rearrangement.
Copper‐Catalyzed Aminothiolation of 1,3‐Dienes via a Dihydrothiazine Intermediate
作者:Christopher E. Sleet、Uttam K. Tambar
DOI:10.1002/anie.201701796
日期:2017.5.8
medicinal chemists and materials scientists. A strategy to reach these architectures via direct difunctionalization of abundant 1,3‐dienes is especially attractive. Herein, we describe the development of a regio‐ and diastereoselective 1,4‐aminothiolation of 1,3‐dienes with a sulfur diimide reagent, a copper catalyst, and alkyl Grignard reagents. This unique protocol provides remote nitrogen and sulfur
Regioselective and diastereoselective aminoarylation of 1,3-dienes
作者:Hongli Bao、Liela Bayeh、Uttam K. Tambar
DOI:10.1039/c4sc01152j
日期:——
incorporating molecular complexity into a class of simple substrates. We report the aminoarylation of acyclic and cyclic 1,3-dienes via the sequential [4+2] cycloaddition with a sulfurdiimide reagent and copper-catalyzed allylic substitution with Grignardreagents. The regioselective and diastereoselective aminoarylation of unsymmetrical dienes is also presented, which highlights the utility of this
Controllable, Sequential, and Stereoselective C–H Allylic Alkylation of Alkenes
作者:Ling Qin、Mohammed Sharique、Uttam K. Tambar
DOI:10.1021/jacs.9b08801
日期:2019.10.30
new C-C bonds represents a powerful approach to generate complex molecules from simple starting materials. However, a general and controllable method for the sequential conversion of a methyl group into a fully substituted carbon center remains a challenge. We report a new method for the selective and sequential replacement of three C-H bonds at the allylicposition of propylene and other simple terminal
将 CH 键直接转化为新的 CC 键代表了一种从简单的起始材料生成复杂分子的强大方法。然而,将甲基顺序转化为完全取代的碳中心的通用且可控的方法仍然是一个挑战。我们报告了一种新方法,用于选择性和顺序替换丙烯和其他简单末端烯烃的烯丙基位置的三个 CH 键,该烯烃具有源自格氏试剂的不同碳基团。铜催化剂和富电子联芳膦配体有助于以高支链选择性形成烯丙基烷基化产物。我们还提出了在催化铜和手性膦配体存在下生成对映体富集的烯丙基烷基化产物的条件。通过这种方法,
Cycloadditions of Donor–Acceptor Cyclopropanes and ‐butanes using S=N‐Containing Reagents: Access to Cyclic Sulfinamides, Sulfonamides, and Sulfinamidines
作者:Gwyndaf A. Oliver、Maximilian N. Loch、André U. Augustin、Pit Steinbach、Mohammed Sharique、Uttam K. Tambar、Peter G. Jones、Christoph Bannwarth、Daniel B. Werz
DOI:10.1002/anie.202106596
日期:2021.12
By employing (3+2)- and (4+2)-cycloadditions of donor–acceptor (D–A) cyclopropanes and cyclobutanes with N-sulfinylamines and sulfur diimides, a variety of isothiazolidines and thiazinanes were synthesized. Use of a sulfinylamine bearing a leaving group, followed by oxidation, led to formal insertion of HNSO2 providing γ-sultams with no N-substitution.