Development of an Efficient
and Straightforward Methodology Toward the Synthesis of Molecularly
Diverse 2,6-Disubstituted 3,4-Dihydropyrimidin-4(3H)-ones
Ugi-Smiles Coupling of Thiouracil Derivatives towards 2,4-Diamino Pyrimidines
作者:Laurent Kaïm、Laurence Grimaud、Madjid Sidhoum
DOI:10.1055/s-0031-1290347
日期:2012.3
Diaminopyrimidines could be synthesized via a multicomponentcoupling starting from S-alkyl thiouracilderivatives. The synthetic strategy based upon an Ugi-Smilescoupling, and subsequent oxidation of the adducts affords a versatileplatform for the preparation of various diaminopyrimidines withfive points of diversity. The whole sequence may be performed asa one-pot process.
Coupling reaction between electron-rich pyrimidinones and α-amino acids promoted by phosphonium salts
作者:Abdelatif ElMarrouni、Josep M. Fabrellas、Montserrat Heras
DOI:10.1039/c1ob05313b
日期:——
Coupling reaction between electron-rich 2-morpholino-4(3H)-pyrimidinone and nucleophilic side chains of several natural α-amino acids promoted by phosphonium salt has been developed to prepare new optically active pyrimidin-4-yl amino acids. The best results were obtained using a two-step method through the easily available benzotriazolyl-1-oxy intermediate. A detailed optimization study of this reaction is discussed.
Synthesis of new unnatural N<sup>α</sup>-Fmoc pyrimidin-4-one amino acids: use of the p-benzyloxybenzyloxy group as a pyrimidinone masking group
作者:Abdellatif ElMarrouni、Montserrat Heras
DOI:10.1039/c4ob02235a
日期:——
The p-benzyloxybenzyloxy group is used to mask the oxo function of the 4(3H)-pyrimidinone ring in the synthesis of new unnatural amino acids. The synthetic approach is based on an aromatic nucleophilic substitution reaction between 4-[4-(benzyloxy)benzyloxy]-2-(benzylsulfonyl)pyrimidine and the nucleophilic side chain of several Nα-Boc amino esters, as the key step, followed by a series of standard
A simple synthetic method for the preparation of optically active pyrimidinyl α-amino acids is presented. A nucleophilic ipso-substitution reaction between 2-(benzylsulfonyl)-4-isopropoxypyrimidines and a nucleophilic side chain of several protected natural α-amino acids is investigated to obtain new pyrimidin-2-yl α-amino acids. A detailed optimisation study of this reaction is discussed. Moreover
S-BENZYLTHIOURACIL COMPOUNDS AND METHODS OF ENHANCING PLANT ROOT GROWTH
申请人:Valent BioSciences Corporation
公开号:US20150201620A1
公开(公告)日:2015-07-23
The present invention is directed to methods for enhancing root growth comprising applying a S-Benzylthiouracil compound, or a salt thereof, to a plant, plant propagation material, root zone, or root of a plant. The invention also relates to methods for reducing the harmful effects of environmentally stressful conditions on plants, such as drought, or intense temperatures, by application of a S-Benzylthiouracil compound, or a salt thereof, to a plant, plant propagation material, root zone, or root of a plant. The invention further relates to new S-Benzylthiouracil derivatives, and salts thereof.