Synthesis of α,β-Unsaturated 4,5-Disubstituted γ-Lactones via Ring-Closing Metathesis Catalyzed by the First-Generation Grubbs' Catalyst
摘要:
4-Methyl-5-alkyl-2(5H)-furanones have been prepared by ruthenium-catalyzed ring-closing metathesis of the suitable methallyl acrylates. Despite the electron deficiency of the conjugated double bond and of the gem-disubstitution of the allylic alkene moiety in the starting acrylates, the first-generation Grubbs' catalyst I proved to be an effective promoter for the ring closure, affording the expected butenolides in good to high yields.
Expanding the Scope of the Gold(I)-Catalyzed Rautenstrauch Rearrangement: Protic Additives
作者:Cédric Bürki、Andrew Whyte、Sebastian Arndt、A. Stephen K. Hashmi、Mark Lautens
DOI:10.1021/acs.orglett.6b02505
日期:2016.10.7
The synthesis of substituted 2-cyclopentenones using a commercially available gold(I) catalyst is described under flexible reaction conditions. During the course of our investigations, we discovered that using a proton source as an additive is required to obtain the desired substituted cyclopentenones in good yields.
The invention is related to anti-viral compounds, compositions containing such compounds, and therapeutic methods that include the administration of such compounds, as well as to processes and intermediates useful for preparing such compounds.
A palladium‐catalyzed intermolecular cross‐coupling of twoaryliodides is reported, giving polycyclic ring systems with a high level of convergence and efficiency.
De Novo Synthesis of Furanose Sugars: Catalytic Asymmetric Synthesis of Apiose and Apiose-Containing Oligosaccharides
作者:Mijin Kim、Soyeong Kang、Young Ho Rhee
DOI:10.1002/anie.201604199
日期:2016.8.8
method towards apiose, a structurally unusual furanose, is reported. The key feature is sequential metal catalysis consisting of the palladium‐catalyzed asymmetric intermolecular hydroalkoxylation of an alkoxyallene and subsequent ring‐closing metathesis (RCM). This strategy enabled the efficient synthesis of various apiose‐containing disaccharides and a unique convergent synthesis of trisaccharides
METHODS FOR THE STEREOSELECTIVE PREPARATION OF APIOSE DERIVATIVES FROM ALLYLIC ALCOHOL COMPOUNDS AND ALLENE COMPOUNDS USING CATALYTIC ASYMMETRIC SYNTHESIS
申请人:POSTECH ACADEMY-INDUSTRY FOUNDATION
公开号:US20170369519A1
公开(公告)日:2017-12-28
The present invention relates to a method for the stereoselective preparation of apiose derivatives from allylic alcohol compounds and allene compounds using catalytic asymmetric synthesis. The method for the stereoselective preparation of apiose derivatives of the present invention is based on the catalytic asymmetric synthesis from allylic alcohol compounds and allene compounds in the presence of a metal catalyst, so that apiose derivatives can be produced stereoselectively, with high yield, with high optical purity regardless of the types of substituents of the compounds. The method of the invention can also be used for the preparation of oligosaccharides including monosaccharides, disaccharides, and polysaccharides or various compounds including apiose derivatives because the method can minimize the production of by-products without using an activating group, unlike the conventional method for the preparation of adipose derivatives.