Iron-Catalyzed Contrasteric Functionalization of Allenic C(sp<sup>2</sup>)–H Bonds: Synthesis of α-Aminoalkyl 1,1-Disubstituted Allenes
作者:Yidong Wang、Sarah G. Scrivener、Xiao-Dong Zuo、Ruihan Wang、Philip N. Palermo、Ethan Murphy、Austin C. Durham、Yi-Ming Wang
DOI:10.1021/jacs.1c07512
日期:2021.9.22
An iron-catalyzed C–H functionalization of simple monosubstituted allenes is reported. An efficient protocol for this process was made possible by the use of a newly developed electron-rich and sterically hindered cationic cyclopentadienyliron dicarbonyl complex as the catalyst and N-sulfonyl hemiaminal ether reagents as precursors to iminium ion electrophiles. Under optimized conditions, the use of
Cobalt-Catalyzed <i>Z</i>
-Selective Hydrosilylation of Terminal Alkynes
作者:Wei Jie Teo、Chao Wang、Ye Wei Tan、Shaozhong Ge
DOI:10.1002/anie.201700868
日期:2017.4.3
A cobalt‐catalyzed Z‐selective hydrosilylation of alkynes has been developed relying on catalysts generated from bench‐stable Co(OAc)2 and pyridine‐2,6‐diimine (PDI) ligands. A variety of functionalized aromatic and aliphatic alkynes undergo this transformation, yielding Z‐vinylsilanes in high yields with excellent selectivities (Z/E ratio ranges from 90:10 to >99:1). The addition of a catalytic amount
Differential Dihydrofunctionalization: A Dual Catalytic Three‐Component Coupling of Alkynes, Alkenyl Bromides, and Pinacolborane
作者:James E. Baumann、Gojko Lalic
DOI:10.1002/anie.202206462
日期:2022.9.12
differential dihydrofunctionalization of terminal alkynes enables the synthesis of allylic boronate esters through reductive three-component coupling of terminal alkynes, alkenyl bromides, and pinacolborane. The transformation is promoted by cooperative action of a copper/palladium catalyst system and results in hydrofunctionalization of both π-bonds of an alkyne.
Rhodium-Catalyzed Enantioselective N-Allylation of Sulfoximines
作者:Yang-yang Li、Bing Gao
DOI:10.1021/acs.orglett.3c00414
日期:2023.4.28
The N-functionalization of free sulfoximines is an important approach to modifying their chemical and biological properties for downstream applications. Here, we report a rhodium-catalyzed N-allylation of free sulfoximines (═NH) with allenes under mild conditions. The redox-neutral and base-free process enables chemo- and enantioselective γ-hydroamination of allenes and gem-difluoroallenes. Synthetic
Stereospecific and Regioselective Synthesis of <i>E</i>-Allylic Alcohols through Reductive Cross Coupling of Terminal Alkynes
作者:Austin B. Shaff、Langxuan Yang、Mitchell T. Lee、Gojko Lalic
DOI:10.1021/jacs.3c06963
日期:——
convergent method for the synthesis of allylicalcohols that involves a reductive coupling of terminal alkynes with α-chloro boronic esters. The new method affords allylicalcohols with excellent regioselectivity (anti-Markovnikov) and an E/Z ratio greater than 200:1. The reaction can be performed in the presence of a wide range of functional groups and has a substrate scope that complements the stoichiometric