A palladium-catalyzed heck-type cascadecyclization of (Z)-1-iodo-1,6-dienes with N-tosyl hydrazones is reported. The alkylpalladium intermediate coupled with the diazo compound, generating the second alkylpalladium species bearing two β-H, which generated a terminal alkene as the major products in the anti-Zaitsev way via the highly regioselective β-H elimination. It provided a new way to synthesize
The scope and limitations of the organolithium-mediated conversion of (3-methoxy N-tosyl aziridines derived from acyclic allylic alcohols into substituted allylic sulfonamides are described.
The Heck/Suzuki tandem reaction has emerged as an essential strategy for the synthesis of complex molecules. Herein, an efficient palladium-catalyzed Heck/Suzuki tandem reaction of (Z)-1-iodo-1,6-dienes with organoboronic acids is described, providing various tetrahydropyridines in good to excellent yields under mild reactionconditions. The key to the success of this approach is the avoidance of the
Heck/Suzuki 串联反应已成为合成复杂分子的基本策略。本文描述了 ( Z )-1-碘-1,6-二烯与有机硼酸的有效钯催化 Heck/Suzuki 串联反应,在温和的反应条件下以良好至优异的产率提供各种四氢吡啶。这种方法成功的关键是避免在转金属步骤之前发生分子内第二次 Heck 插入。此外,还研究了该反应的不对称形式,以优异的产率和良好的对映选择性提供手性四氢吡啶。
Synthesis of <i>N</i>-Tosyl Allylic Amines from Substituted Alkenes via Vanadoxaziridine Catalysis
作者:Rufai Madiu、Erin L. Doran、Jenna M. Doran、Ali A. Pinarci、Kiran Dhillon、Dominic A. Rivera、Amari M. Howard、James L. Stroud、Dylan A. Moskovitz、Steven J. Finneran、Alyssa N. Singer、Morgan E. Rossi、Gustavo Moura-Letts
DOI:10.1021/acs.joc.3c02859
日期:2024.3.15
Herein, we report the catalytic allylic amination of α-methylalkenes with V2O3Dipic2(HMPA)2 and chloramine T as the quantitative source of N. The reaction works with high yields and stereoselectivities for α-methylalkenes. A proposed tosylnitrene-free catalytic cycle involving the formation of vanadoxaziridine complex 1 as the active catalyst and aminovanadation across the substrate as the rate-determining
在此,我们报道了以V 2 O 3 Dipic 2 (HMPA) 2和氯胺T作为N定量源的α-甲基烯烃的催化烯丙基胺化反应。该反应对 α-甲基烯烃具有高产率和立体选择性。提出了一种不含甲苯磺酰氮的催化循环,涉及形成钒氧氮丙啶配合物1作为活性催化剂,并通过底物进行氨基钒化作为限速步骤。初始动力学和竞争实验为所提出的机制提供了证据。