Enantioselective Total Synthesis of Diocollettines A
作者:Yuichiro Kawamoto、Toyoharu Kobayashi、Hisanaka Ito
DOI:10.1021/acs.orglett.9b01776
日期:2019.8.2
The first enantioselectivetotalsynthesis of diocollettines A was accomplished in only six steps from a known compound. A short and practical synthetic route was disclosed, featuring an intensive investigation of the stereoselective aldol reaction as a key step using an easily prepared aldehyde moiety and an enone derivative. The synthetic scheme also includes the efficient stereocontrolled construction
Enantioselective, Organocatalytic Oxy-Michael Addition to γ/δ-Hydroxy-α,β-enones: Boronate-Amine Complexes as Chiral Hydroxide Synthons
作者:De Run Li、Andiappan Murugan、J. R. Falck
DOI:10.1021/ja076802c
日期:2008.1.1
An organocatalytic, enantioselective oxy-Michael addition to achiral gamma- and delta-hydroxy-alpha, beta-enones was developed. The key transformation is an unprecedented, asymmetric conjugate addition triggered by complexation between an in situ generated boronic acid hemiester and a chiral amine catalyst. Functionally, the intermediate amine-boronate complex acts as a chiral hydroxide surrogate or synthon. The resultant chiral beta-hydroxy-ketones are obtained in good to excellent yields and high ee following mild oxidative removal of the cyclic boronate. Natural products (R,12Z,15Z)-2-hydroxy-4-oxohenicosa-12,15-dienyl acetate and (+)-(S)-streptenol A were synthesized to demonstrate the utility of this reaction.
[EN] AGENTS WITH ANTIFUNGAL ACTIVITY AND METHODS OF USE THEREOF<br/>[FR] AGENTS ANTIFONGIQUES ET LEURS PROCEDES D'UTILISATION
申请人:UNIVERSITY OF ALBERTA
公开号:WO1997048279A1
公开(公告)日:1997-12-24
(EN) An antifungal composition is disclosed comprising at least one compound selected from the group consisting of: (a) at least one compound of formula (I), and (b) at least one compound of formula (II), or an alkali or alkali earth salt thereof, and a carrier or diluent therefor. Methods of reducing or inhibiting fungal growth, fungal wood decay and fungal wood stain are also disclosed, along with a method of reducing or inhibiting fairy rings. Paints, stains, cleaning products, disinfectants and wood or lawn treatments containing the compounds are also disclosed.(FR) Composition antifongique contenant au moins un composé sélectionné dans le groupe constitué par: (a) au moins un composé représenté par la formule (I) et (b) au moins un composé représenté par la formule (II), ou un des ses sels alcalins ou terreux alcalins, ainsi qu'un véhicule et un diluant. Procédés servant à limiter ou à inhiber la croissance des champignons, la détérioration du bois et les taches sur le bois provoquées par les champignons, et procédé servant à limiter ou à empêcher les ronds de sorcière. Produits servant à nettoyer la peinture et les taches, désinfectants et produits de traitement du bois et de la pelouse contenant ces composés.