[EN] BICYCLIC HETEROCYCLE DERIVATIVES HAVING SELECTIVE BACE1 INHIBITORY ACTIVITY<br/>[FR] DÉRIVÉS D'HÉTÉROCYCLES BICYCLIQUES AYANT UNE ACTIVITÉ INHIBITRICE SÉLECTIVE DE BACE1
申请人:SHIONOGI & CO
公开号:WO2019208509A1
公开(公告)日:2019-10-31
The present invention provides a compound which has an effect of inhibiting amyloid β production, especially an effect of inhibiting selective BACE1, and which is useful as a therapeutic or prophylactic agent for diseases induced by production, secretion and/or deposition of amyloid β proteins. A compound of the formula (IA) or the like, wherein -A1- is alkylene optionally substituted with one or more halogen; R2 is substituted or unsubstituted alkyl or the like; R3 and R4 are each independently a hydrogen atom, halogen, alkyl or haloalkyl or the like; R5 is a hydrogen atom or halogen; A4 is N or CR6 wherein R6 is a hydrogen atom, halogen, or substituted or unsubstituted alkyl; A5 is NR7 or CR8R9; A6 is CR18 or N; R18 is a hydrogen atom; R7 is substituted or unsubstituted alkyl; R8 and R9 are each independently a hydrogen atom, halogen, alkyl or haloalkyl or the like; and Ring B is bicyclic ring; or a pharmaceutically acceptable salt thereof.
Experimental and Computational Investigations of the Reactions between α,β‐Unsaturated Lactones and 1,3‐Dienes by Cooperative Lewis Acid/Brønsted Acid Catalysis
作者:Anja Weber、Martin Breugst、Jörg Pietruszka
DOI:10.1002/ange.202008365
日期:2020.10.12
AbstractThe reactions of α,β‐unsaturated δ‐lactones with activated dienes such as 1,3‐dimethoxy‐1‐[(trimethylsilyl)oxy]‐1,3‐butadiene (Brassard's diene) are barely known in literature and show high potential for the synthesis of isocoumarin moieties. An in‐depth investigation of this reaction proved a stepwise mechanism via the vinylogous Michael‐products. Subsequent cyclisation and oxidation by LHMDS
Abstract A short and efficient enantio- and diastereoselectivesynthesis of different representatives from the class of dihydro-α-pyrone natural products, including both enantiomers of goniothalamin, massoia lactone, parasorbic acid, and some derivatives is presented. It is based on the application of enantiopure α-chiral allylboronic esters in allyl additions. A short and efficient enantio- and diastereoselective
Asymmetric synthesis of goniothalamin, hexadecanolide, massoia lactone, and parasorbic acid via sequential allylboration–esterification ring-closing metathesis reactions
作者:P.Veeraraghavan Ramachandran、M.Venkat Ram Reddy、Herbert C Brown
DOI:10.1016/s0040-4039(99)02130-9
日期:2000.1
ylborane, when refluxed in dichloromethane in the presence of 10 mol% of Grubbs' catalyst provided the natural enantiomers of (S)-(+)-parasorbic acid, (R)-(–)-massoia lactone, and (R)-(+)-goniothalamin. (S)-(–)-Hexadecanolide was prepared by hydrogenating the corresponding lactenone synthesized using the above sequence.
Synthesis of (−)-Viriditoxin: A 6,6′-Binaphthopyran-2-one that Targets the Bacterial Cell Division Protein FtsZ
作者:Young Sam Park、Charles I. Grove、Marcos González-López、Sameer Urgaonkar、James C. Fettinger、Jared T. Shaw
DOI:10.1002/anie.201007298
日期:2011.4.11
Remote control: Vanadium catalysts provide the key to synthesizing the bacteria‐fighting natural product viriditoxin. An achiral catalyst shows modest levels of remote diastereocontrol induced by the lactone stereogenic center and chiral catalysts can be used to enhance or reverse this inherent selectivity.