Iodine(III)-Promoted Ring Expansion of 1-Vinylcycloalkanol Derivatives: A Metal-Free Approach toward Seven-Membered Rings
作者:Luiz F. Silva,、Ramon S. Vasconcelos、Mário A. Nogueira
DOI:10.1021/ol800048f
日期:2008.3.1
A versatile and metal-free approach for the synthesis of molecules bearing seven- and eight-membered rings is described. The strategy is based on the ringexpansion of 1-vinylcycloalkanols (or the corresponding silyl or methyl ether) mediated by the hypervalent iodine reagent HTIB (PhI(OH)OTs). The reaction condition can be easily adjusted to give seven-membered rings bearing different functional groups
Copper-Free Asymmetric Allylic Alkylation of Trisubstituted Cyclic Allyl Bromides Using Grignard Reagents
作者:David Grassi、Alexandre Alexakis
DOI:10.1002/anie.201307591
日期:2013.12.16
AAA: The asymmetric allylic alkylation (AAA) of trisubstituted cyclic allyl bromides with Grignardreagents is catalytic (2 mol % of ligand) and regioselective (SN2'/SN2=91:9→100:0). The quaternary carbon centers are formed with good to high enantioselectivity (e.r.=81.5:19.5→96:4).
[EN] SPIROAMINODIHYDROTHIAZINE DERIVATIVES<br/>[FR] DÉRIVÉS DE SPIROAMINODIHYDROTHIAZINE
申请人:EISAI R&D MAN CO LTD
公开号:WO2010013794A1
公开(公告)日:2010-02-04
A compound represented by the general formula (I): or a pharmaceutically acceptable salt thereof, has an Aβ production inhibitory effect or a BACE1 inhibitory effect and is useful as a prophylactic or therapeutic agent for a neurodegenerative disease caused by Aβ and typified by Alzheimer- type dementia.
A compound represented by the general formula (I): or a pharmaceutically acceptable salt thereof, has an Aβ production inhibitory effect or a BACE1 inhibitory effect and is useful as a prophylactic or therapeutic agent for a neurodegenerative disease caused by Aβ and typified by Alzheimer-type dementia.