Chiral Alkyl Amine Synthesis via Catalytic Enantioselective Hydroalkylation of Enecarbamates
作者:Deyun Qian、Srikrishna Bera、Xile Hu
DOI:10.1021/jacs.0c11630
日期:2021.2.3
Chiral alkyl amines are omnipresent as bioactive molecules and synthetic intermediates. The catalytic and enantioselective synthesis of alkyl amines from readily accessible precursors is challenging. Here we develop a nickel-catalyzed hydroalkylation method to assemble a wide range of chiral alkyl amines from enecarbamates (N-Cbz-protected enamines) and alkyl halides with high regio- and enantioselectivity
Photochemical Alkene Isomerization for the Synthesis of Polysubstituted Furans and Pyrroles under Neutral Conditions
作者:Johannes C. L. Walker、Simon Werrel、Timothy J. Donohoe
DOI:10.1002/chem.201903590
日期:2019.10.11
A photochemical approach to polysubstituted heterocycles using UV-induced alkene isomerization is described. The method allows for the synthesis of disubstituted furans and pyrroles under mild and neutral conditions and also provides access to a class of trisubstituted furans pertinent to natural-product synthesis. The method has broad functional-group tolerance and many richly decorated heterocycles
synthetic equivalents of a variety of α‐carboxylate anions. Phase‐transfer catalysis (PTC) enabled their mild deprotonation and catalytic asymmetric addition to highly reactive imines generated in situ from α‐amidosulfones (see scheme; Pg=protecting group). The synthetic utility of the products was demonstrated by their straightforward transformation into a range of β‐amino acid derivatives.
Reaction of Allylzinc Reagents and Zinc Enolates of Ketones with α-Amidoalkylphenyl Sulfones
作者:Marino Petrini、Roberto Profeta、Paolo Righi
DOI:10.1021/jo025606f
日期:2002.6.1
Alpha-amidoalkylphenyl sulfones behave as N-acylimino equivalents in the reaction with functionalized allylzinc reagents. The addition products obtained using the zinc derivative of ethyl 2-(bromomethyl)acrylate can be readily transformed into alpha-methylene-gamma-lactams using different cyclization procedures. The allylzinc reagent obtained from 3-bromo-1-acetoxy-1-propene directly affords protected
Reaction of α-amidoalkylphenyl sulfones with Reformatsky reagents. A new entry to β-amino esters
作者:Tiziana Mecozzi、Marino Petrini
DOI:10.1016/s0040-4039(00)00245-8
日期:2000.4
The reaction of Reformatsky reagents with α-amidoalkylphenyl sulfones proceeds in dichloromethane at room temperature leading to the synthesis of the corresponding β-amino esters in good yields. The procedure presents syn stereoselectivity and can be also extended to Reformatsky reagents based on γ-bromocrotonates.