A convenient preparation of (S)-(−)-4-hydroxy-2-methylcyclopent-2-en-1-one and its application as a chiral synthetic equivalent of 2-methylcyclopent-2-en-1-one in the terpenoid synthesis
作者:Karol Michalak、Jerzy Wicha
DOI:10.1016/j.tet.2014.06.006
日期:2014.8
from 1-(2-furyl)ethanol using modified Piancatelli rearrangement and enzymatic kinetic resolution of the racemate was developed. An application of O-protected derivatives of 4-hydroxy-2-methylcyclopent-2-en-1-one to terpenoid synthesis through tandem conjugate addition of allyl-metal reagents, enolate trapping, and consecutive Mukaiyama–Michael addition was studied. An optically active azulene derivative
The potential of merging photoredox and nickel catalysis to perform multicomponent alkene difunctionalizations under visible-light irradiation is demonstrated here. Secondary and tertiary alkyl groups, as well as sulfonyl moieties can be added to the terminal position of the double bond with simultaneous arylation of the internal carbon atom in a single step under mild reaction conditions. The process
Synthesis of β,γ-unsaturated N-acyl-2-oxazolidinones
作者:Alicia Dobarro、Dolores Velasco
DOI:10.1016/0040-4020(96)00826-5
日期:1996.10
An effective imide formation method is presented, which allows the preparation of β,γ-unsaturatedN-acyl-2-oxazolidinones with high yields and without isomerization of the double bond to give the α,β-unsaturated isomers, which are the inevitable by-products when alternative procedures are used.
Reductive Asymmetric Aza‐Mislow‐Evans Rearrangement by 1,3,2‐Diazaphospholene Catalysis**
作者:Guoting Zhang、Nicolai Cramer
DOI:10.1002/anie.202301076
日期:——
A 1,3,2-diazaphospholene-catalyzed three-step cascade transformation of chiral N-sulfinyl acrylamides comprised of a conjugate reduction, enantiospecific [2,3]-sigmatropic aza-Mislow-Evans rearrangement, and subsequent S−O bond reductive cleavage provides access to synthetically valuable enantio-enriched α-hydroxy amides. Various α-hydroxy amides are obtained in good yields and high enantioselectivities