Ph3PAuNTf2 as a Superior Catalyst for the Selective Synthesis of 2H-Chromenes: Application to the Concise Synthesis of Benzopyran Natural Products
作者:Ioannis N. Lykakis、Christina Efe、Charis Gryparis、Manolis Stratakis
DOI:10.1002/ejoc.201001674
日期:2011.4
Ph3PAuNTf2 (≈1 mol-%) catalyzes the selective cycloisomerization of substituted aryl propargylethers into 2H-chromenes in excellent yields. Benzofuran byproducts are formed only in the case of electron-deficient arenes, in up to 7 % relative yield. The Ph3PAuNTf2-catalyzed cyclization of aryl propargylethers was applied as a key step to the concise synthesis of the naturally occurring benzopyrans
[EN] HIGHLY SELECTIVE AKR1C3 INHIBITORS AND METHODS OF USE THEREOF<br/>[FR] INHIBITEURS D'AKR1C3 HAUTEMENT SÉLECTIFS ET LEURS PROCÉDÉS D'UTILISATION
申请人:UNIV TEXAS TECH SYSTEM
公开号:WO2018148721A1
公开(公告)日:2018-08-16
The present invention includes methods and compositions that inhibit AKR1C3 enzymatic activity and consequently reduces androgen receptor (AR) transactivation, AR and prostate specific antigen (PSA) expression levels in, for example, prostate cancer, castration-resistant prostate cancer, breast cancer, acute myeloid leukemia (AML), T-cell acute lymphoblastic leukemia (T-ALL), or a leukemia.
their phenethyl esters were synthesized and evaluated as inhibitors of cys-LTs release. Artepillin C, baccharin, and kaempferide were the major active components of the ethanol extract. The inhibitory activity of artepillin C phenethyl ester was comparable to that of existing LT synthesis inhibitors.
Synthesis of phenolic natural products using palladium catalyzed coupling reactions
作者:Roderick W. Bates、Christine J. Gabel、Jianhua Ji、Thota Rama-Devi
DOI:10.1016/0040-4020(95)00441-a
日期:1995.7
Derivatives of 2,4-diiodophenol are shown to undergo palladium catalyzed carbonylation and alkyne coupling reactions in excellent to moderate yield and high regioselectivity. The scope of these reactions is explored. Palladium catalyzed reactions are employed as the key steps in the synthesis of three phenolic natural products: Plicatin B, Drupanin and Eutypine.
The synthesis of Plicatin B via the Heck reaction
作者:Roderick W Bates、Christine J Gabel
DOI:10.1016/s0040-4039(00)73632-x
日期:1993.5
The anti-microbial natural product Plicatin B has been synthesized in 53% overall yield using a Heck reaction as the key step. The optimum conditions for this reaction have been determined. Halophenols proved much less reactive than their corresponding acetates.