Nitration of α,β-unsaturated esters. Evidence for positive charge build-up adjacent to carbonyl carbon
作者:Stuart A. Hewlins、John A. Murphy、Jian Lin、David E. Hibbs、Michael B. Hursthouse
DOI:10.1039/a607170h
日期:——
Reactive intermediates formed in the nitration of certain
α,β-unsaturated esters with nitronium tetrafluoroborate
exhibit behaviour expected of highly reactive α-carbonyl cations.
Three diagnostic reaction types have been observed which indicate the
presence of these destabilised cations: (i) trapping in a Ritter
reaction, (ii) cyclopropane formation from propyl cations, (iii)
WagnerâMeerwein migration of alkyl groups. Semi-empirical
calculations of the relative gas-phase stabilities of the proposed
intermediate cations are useful in rationalising the observed
chemistry.
Highly Enantioselective Intermolecular Stetter Reaction of Simple Acrylates: Synthesis of α-Chiral γ-Ketoesters
作者:Nathalie E. Wurz、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/chem.201202432
日期:2012.12.14
Simple Stetter: A novel N‐heterocyclic carbene (NHC) was designed by combining an electron‐rich 2,6‐dimethoxy substituent and an underestimated yet promising chiral motif. With this NHC in hand, a highlyenantioselectiveintermolecularStetterreaction of simple acrylates was developed, yielding versatile α‐chiral γ‐ketoesters. This represents the first catalytic asymmetric route towards these valuable
[EN] CASPASE INHIBITORS CONTAINING ISOXAZOLINE RING<br/>[FR] INHIBITEURS DE CASPASES CONTENANT UN CYCLE ISOXAZOLINIQUE
申请人:LG LIFE SCIENCES LTD
公开号:WO2005021516A1
公开(公告)日:2005-03-10
The present invention relates to an isoxazoline derivative as an inhibitor against various caspases, a process for preparing the same, and a therapeutic composition for preventing inflammation and apoptosis comprising the same
[EN] N-HETEROARYLALKYL-2-(HETEROCYCLYL AND HETEROCYCLYLMETHYL) ACETAMIDE DERIVATIVES AS SSTR4 AGONISTS<br/>[FR] DÉRIVÉS DE N-HÉTÉROARYLALKYLE-2-(HÉTÉROCYCLYLE ET HÉTÉROCYCLYLMÉTHYLE) ACÉTAMIDE UTILISÉS EN TANT QU'AGONISTES DE SSTR4
申请人:TAKEDA PHARMACEUTICALS CO
公开号:WO2021202781A1
公开(公告)日:2021-10-07
Disclosed are compounds of Formula 1, and pharmaceutically acceptable salts thereof, wherein L, n, R1, R2, R6, R7, R8, R9, R10, X3, X4 and X5 are defined in the specification. This disclosure also relates to materials and methods for preparing compounds of Formula 1, to pharmaceutical compositions which contain them, and to their use for treating diseases, disorders, and conditions associated with SSTR4.
Asymmetric synthesis of β2-amino acids: 2-substituted-3-aminopropanoic acids from N-acryloyl SuperQuat derivatives
作者:James E. Beddow、Stephen G. Davies、Kenneth B. Ling、Paul M. Roberts、Angela J. Russell、Andrew D. Smith、James E. Thomson
DOI:10.1039/b707689d
日期:——
Conjugateaddition of lithium dibenzylamide to (S)-N(3)-acryloyl-4-isopropyl-5,5-dimethyloxazolidin-2-one (derivedfrom l-valine) and alkylation of the resultant lithium beta-amino enolate provides, after deprotection, a range of (S)-2-alkyl-3-aminopropanoic acids in good yield and high ee. Alternatively, via a complementary pathway, conjugateaddition of a range of secondary lithium amides to (S)