Propargylic Amination Enabled the Access to Enantioenriched Acyclic α-Quaternary α-Amino Ketones
作者:Wusheng Guo、Linhong Zuo、Manying Cui、Biwei Yan、Shaofei Ni
DOI:10.1021/jacs.1c03182
日期:2021.5.26
A propargylic amination approach toward chiral acyclic α-quaternary α-aminoketones is described. This Cu-catalyzed procedure could be performed open to air using commercially available amines as nucleophiles. The key to success is the use of rationally designed propargylic cyclic carbonates as substrates, which can generate a Cu-bonded enolate zwitterionic intermediate upon decarboxylation. This protocol
Palladium-Catalyzed Silastannation of Secondary Propargylic Alcohols and their Derivatives
作者:David Tanner、Thomas E. Nielsen、Sebastian Le Quement
DOI:10.1055/s-2004-822380
日期:——
A series of terminal propargylic alcohols and their derivatives were subjected to Pd-catalyzed silastannation. In all reactions, complete regio- and stereoselectivities were observed with the tributyltin moiety exclusively adding to the internal carbon of the triple bond in a cis fashion, including the first example of a diyne bis-silastannation. Silastannation reaction products could sequentially
endo‐Rule for gold: A highly endo‐selective gold‐catalyzed cycloisomerization of 1,4‐diynes was developed. By employing electron‐rich phosphines and N‐heterocyclic carbenes as ligands, a number of 1,4‐diynes could be cyclized in a desymmetrizing fashion to form dihydrodioxepines and enantiomerically enriched tetrahydrooxazepines (see scheme).
Copper‐Catalyzed Enantioselective C1,N‐Dipolar (3+2) Cycloadditions of 2‐Aminoallyl Cations with Indoles
作者:Lulu Shen、Yin Zheng、Zitong Lin、Tianzhu Qin、Zhongxing Huang、Weiwei Zi
DOI:10.1002/anie.202217051
日期:2023.2.13
A binuclear copper-catalyzed (3+2) cycloaddition of 2-aminoallyl cations with indoles was achieved. This transformation featured a unique C1,N-dipolar cycloaddition reactivity for 2-aminoallyl cations. Enantioenriched pyrroloindoline derivatives were prepared by this cycloaddition in high yields with good enantio- and diastereoselectivities.