A Boron Activating Effect Enables Cobalt-Catalyzed Asymmetric Hydrogenation of Sterically Hindered Alkenes
作者:Peter Viereck、Simon Krautwald、Tyler P. Pabst、Paul J. Chirik
DOI:10.1021/jacs.9b12214
日期:2020.2.26
8-diaminonaphthalatoboryl) substituent each were hydrogenated in high yield and enantioselectivity using C1-symmetric pyridine(diimine) (PDI) cobalt complexes. High activities and stereoselectivities were observed with an array of 2-alkyl, 2-aryl, and 2-boryl-substituted 1,1-diboryl alkenes, giving rise to enantioenriched diborylalkane building blocks. Systematic study of substrate substituenteffects identified competing
Cyanophosphates (CPs) can be easily prepared from either ketones or aldehydes, and their reaction with NaN3–Et3N·HCl results in the formation of azidotetrazoles. Under microwave irradiation, successive fragmentation of the azidotetrazoles generates alkylidene carbenes that undergo [1,2]-rearrangement and are transformed into homologous alkynes. Treatment of ketone-derived CPs with TMSN3 and Bu2SnO
Ynamide Carbopalladation: A Flexible Route to Mono‐, Bi‐ and Tricyclic Azacycles
作者:Craig D. Campbell、Rebecca L. Greenaway、Oliver T. Holton、P. Ross Walker、Helen A. Chapman、C. Adam Russell、Greg Carr、Amber L. Thomson、Edward A. Anderson
DOI:10.1002/chem.201501710
日期:2015.9
Bromoenynamides represent precursors to a diversity of azacycles by a cascade sequence of carbopalladation followed by cross‐coupling/electrocyclization, or reduction processes. Full details of our investigations into intramolecular ynamidecarbopalladation are disclosed, which include the first examples of carbopalladation/cross‐coupling reactions using potassium organotrifluoroborate salts; and an
Total Synthesis and Structural Revision of Antibiotic CJ-16,264
作者:K. C. Nicolaou、Akshay A. Shah、Henry Korman、Tabrez Khan、Lei Shi、Wisuttaya Worawalai、Emmanuel A. Theodorakis
DOI:10.1002/anie.201504337
日期:2015.8.3
The totalsynthesis and structural revision of antibiotic CJ‐16,264 is described. Starting with citronellal, the quest for the target molecule featured a novel bis‐transannular Diels–Alder reaction that casted stereoselectively the decalin system and included the synthesis of six isomers before demystification of its true structure.
Total Synthesis and Stereochemical Assignment of Talaroconvolutin A and Talarofuranone: Gram‐scale Synthesis of Ferroptosis Inducer Talaroconvolutin A
作者:Ming Yao、Wei Yang、Jing Li、Chengyun Huang、Jin Fang、Sulu Qin、Shuzhi Liu、Xiaolong Yang
DOI:10.1002/cjoc.202400061
日期:2024.7
The first totalsynthesis of talaroconvolutin A (1.1 g obtained) and talarofuranone has been achieved using accessible materials (12 steps, 7.5% and 8.2% yields, respectively). Convergent routes involved intramolecular Diels−Alder reactions in two approaches for creating the decalin moiety. Additionally, an unprecedented DMP-mediated domino reaction resulted in the deoxy-tetramic acid system. These
使用可获取的材料首次实现了talaroconvolutin A(获得1.1 g)和talarofuranone的全合成(12步,产率分别为7.5%和8.2%)。收敛路线涉及分子内狄尔斯-阿尔德反应,有两种方法用于产生十氢萘部分。此外,前所未有的 DMP 介导的多米诺骨牌反应产生了脱氧四胺酸系统。这些合成不仅建立了 talaroconvolutin A 的绝对构型,而且还使得能够对此类铁死亡诱导剂进行进一步的合作研究。