Stereodivergent Total Syntheses of (+)‐Monomorine I and (+)‐Indolizidine 195B
作者:Rafid S. Dawood、Robert A. Stockman
DOI:10.1002/ejoc.202100453
日期:2021.7.22
Diastereoselective addition to a single sulfinimine allows for stereodivergeant synthetic approaches towards two related natural products monomorine and indolizidine 195B via closed or open transition states.
A highly selective C-H amination reaction under iron catalysis has been developed. This novel system, which employs an inexpensive, nontoxic [Fe(III)Pc] catalyst (typically used as an industrial ink additive), displays a strong preference for allylic C-H amination over aziridination and all other C-H bond types (i.e., allylic > benzylic > ethereal > 3° > 2° ≫ 1°). Moreover, in polyolefinic substrates
A photocatalytic synthesis of homoallyl ketones was achieved via a one-pot procedure starting from a Norrish Type I reaction of cyclopentanones, followed by a decatungstate-catalyzed hydroacylation of electron-deficient olefins by the resulting 4-pentenals. The site-selective formyl H-abstraction in the second step can be explained by radical polar effects in the transition state.
Stereoselective Synthesis of <i>cis-</i>2,5-Disubstituted Pyrrolidines via Wacker-Type Aerobic Oxidative Cyclization of Alkenes with <i>tert</i>-Butanesulfinamide Nucleophiles
作者:Joanne E. Redford、Richard I. McDonald、Matthew L. Rigsby、Joshua D. Wiensch、Shannon S. Stahl
DOI:10.1021/ol3000519
日期:2012.3.2
Palladium(II)-catalyzed aerobic oxidative cyclization of alkenes with tethered tert-butanesulfinamides furnishes enantiopure 2,5-disubstitutedpyrrolidines, originating from readily available and easily diversified starting materials. These reactions are the first reported examples of metal-catalyzed addition of sulfinamide nucleophiles to alkenes.
钯 (II) 催化的烯烃与束缚的叔丁烷亚磺酰胺的有氧氧化环化提供了对映纯的 2,5-二取代吡咯烷,其源自容易获得且易于多样化的起始材料。这些反应是第一个报道的金属催化亚磺酰胺亲核试剂加成到烯烃的例子。
Improved Cope-type hydroamination reactivity of hydrazine derivatives
作者:Francis Loiseau、Christian Clavette、Michaël Raymond、Jean-Grégoire Roveda、Alishya Burrell、André M. Beauchemin
DOI:10.1039/c0cc02403a
日期:——
A systematic investigation on the metal-free, Cope-type hydroamination reactivity of hydrazides and analogues is reported. Optimization of the hydrazide structure resulted in more facile intramolecular reactivity and enabled intermolecular reactions of alkenes, thus providing a direct approach to polysubstituted hydrazides.