Catalytic Metal-free Allylic C–H Amination of Terpenoids
作者:Wei Pin Teh、Derek C. Obenschain、Blaise M. Black、Forrest E. Michael
DOI:10.1021/jacs.0c06997
日期:2020.9.30
selective replacement of C-H bonds in complex molecules, especially natural products like terpenoids, is a highly efficient way to introduce new functionality and/or couple fragments. Here, we report the development of a new metal-free allylic amination of alkenes that allows the introduction of a widerange of nitrogen functionality at the allylic position of alkenes with unique regioselectivity and no
An efficient SbCl3-metal system for allylation, reduction and acetalization of aldehydes
作者:- Bo Wang Wei、Shi Li-Lan、Huang Yao-Zeng
DOI:10.1016/s0040-4020(01)85467-3
日期:1990.1
allylatlon of aldehydes with allylic halides at room temperature to give high yields of the corresponding homoallylic alcohols with high regio- and chemoselectivity. SbCl3-Al or SbCl3-Zn in DMF-H2O was found to be an efficient reduction system for conversion of aldehydes to alcohols at room temperature in excellent yields. While alcohol was used as solvent instead of DMF-H2o, the acetalization product was
Chloration allylique d'olefines de type isoprenique a l'aide du chlorure de sulfuryle
作者:Michel Bulliard、Geneviève Balme、Jacques Gore
DOI:10.1016/s0040-4039(00)76192-2
日期:1989.1
Sulfuryl chloride is a convenient reagent for the allylic chlorination of olefins bearing an isopropenyl or isopropylidenyl moeity. The substitution occurs with good yields and with allylic rearrangement, giving in most cases a secondary chloride.
Site-Selective Cu-Catalyzed Alkylation of α-Amino Acids and Peptides toward the Assembly of Quaternary Centers
作者:Marcos San Segundo、Arkaitz Correa
DOI:10.1002/cssc.201802216
日期:2018.11.23
The CuI‐catalyzed selective α‐alkylation of α‐amino acid and peptide derivatives with 2‐alkyl‐1,3‐dioxolanes is reported. This oxidative coupling is distinguished by its site‐specificity, high diastereoselectivity, and chirality preservation and exhibits absolute chemoselectivity for N‐aryl glycine motifs over other amino acid units. Collectively, the method allows for the assembly of challenging quaternary
Organocatalytic epoxidation and allylic oxidation of alkenes by molecular oxygen
作者:Marina Petsi、Maria Orfanidou、Alexandros L. Zografos
DOI:10.1039/d1gc03029a
日期:——
reduction of dioxygen by Hantzsch ester under mild conditions to allow the aerobic metal-free epoxidation of electron-rich alkenes. Mechanistic crossovers are underlined, explaining the dual role of Hantzsch ester as a reductant/promoter of the DKP catalyst and a simultaneous competitor for the epoxidation of alkenes when HFIP is used as a solvent. Expansion of this protocol to the synthesis of allylic alcohols