This invention relates to new tetronic and tetramic acid derivatives with beta-secretase inhibitory activity of formula I:
wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
5′
, R
6
and R
6′
are as defined hereinabove, to processes for their preparation, compositions containing said tetronic and tetramic acid derivatives and their use in the treatment and prevention of diseases modulated by an inhibitor of β-secretase, such as Alzheimer's disease.
PROCESS FOR THE PREPARATION OF 2-TRIFLUOROMETHYL-5-(1-SUBSTITUTED)ALKYLPYRIDINES
申请人:Bland Douglas C.
公开号:US20100004457A1
公开(公告)日:2010-01-07
2-Trifluoromethyl-5-(1-substituted)alkylpyridines are produced efficiently and in high yield from an alkyl vinyl ether and trifluoroacetyl chloride by cyclization.
2-三氟甲基-5-(1-取代)烷基吡啶可以通过烷基乙烯醚和三氟乙酰氯的环化反应高效且高产率地制备。
An Alkyne Hydroacylation Route to Highly Substituted Furans
作者:Philip Lenden、David A. Entwistle、Michael C. Willis
DOI:10.1002/anie.201105795
日期:2011.11.4
More rings for your rhodium: Rhodium‐catalyzed intermolecularalkynehydroacylations deliver γ‐hydroxy‐α,β‐enones, which can be cyclized in situ to deliver di‐ and trisubstituted furans. Functionalization of the intermediates using Heck chemistry allows the formation of regioisomeric furans. The use of an alternative RhI catalyst delivers 1,4‐dicarbonyl compounds and hence pyrroles, thiophenes, and
PROCESS FOR THE ADDITION OF THIOLATES TO ?,?-UNSATURATED CARBONYL OR SULFONYL COMPOUNDS
申请人:McConnell James R.
公开号:US20100048939A1
公开(公告)日:2010-02-25
Alkylthio substituted aldehydes, ketones, esters and sulfones are prepared by reacting α,β-unsaturated carbonyl and sulfonyl compounds with a sodium or potassium thiolate in the presence of a alkane carboxylic acid and water.
Organocatalytic Asymmetric Synthesis of Chiral Dioxazinanes and Dioxazepanes with <i>in Situ</i> Generated Nitrones via a Tandem Reaction Pathway Using a Cooperative Cation Binding Catalyst
作者:Yidong Liu、Jun Ao、Sushovan Paladhi、Choong Eui Song、Hailong Yan
DOI:10.1021/jacs.6b10660
日期:2016.12.21
pharmaceuticals and biological processes. Cycloaddition reactions are most suitable synthetic tools to efficiently construct chemically diverse sets of heterocycles with great structural complexity owing to the simultaneous or sequential formation of two or more bonds, often with a high degree of selectivity. Herein, we report an unprecedented formal cycloaddition of N-Boc-N-hydroxy amido sulfones as the nitrone