A concise, highly stereoselective synthesis of 2,4- and 2,5-disubstituted thiazole amino acids was developed. These are important building blocks for various biologically active thiazole-containing natural peptides and their regioisomeric analogues. The fundamental reactions are diastereoselective addition of (4- or 5-bromothiazol-2-yl)lithium to N-tert-butanesulfinyl imine with subsequent Pd-catalyzed
Directed ortho-lithiation of unprotected diphenylphosphinic acids
作者:Víctor Yañez Rodríguez、Miguel Ángel del Águila、María José Iglesias、Fernando López Ortiz
DOI:10.1016/j.tet.2012.06.088
日期:2012.9
Directed ortho lithiation of diphenylphosphinic acid and subsequent electrophilic trapping provides mono ortho-functionalized derivatives including enantiopure γ-aminophosphinic acids in moderate yields. Copper catalyzed coupling of the ortho anion leads to biphenyl-2,2′-diylbis(phenylphosphinic acid), a phosphorus analogue of biphenyl-2,2′-dicarboxylic acid. Preliminary studies of the metal-binding
The authors thank the Spanish Ministerio de Ciencia e Innovacion (MICINN) (grant numbers CTQ2007-65218, Consolider Ingenio 2010-CSD-2007-00006 and CTQ2011-24165), the Generalitat Valenciana (PROMETEO/2009/039), the Fondos Europeos para el Desarrollo Regional (FEDER)) and the University of Alicante for financial support.
作者感谢西班牙国家科学与创新部长 (MICINN)(授权号 CTQ2007-65218、Consolider Ingenio 2010-CSD-2007-00006 和 CTQ2011-24165)、Generalitat Valenciana (PROMETEO/2909), el Desarrollo Regional (FEDER)) 和阿利坎特大学的财政支持。
Microwave-Assisted Solvent-Free Synthesis of Enantiomerically Pure <i>N</i>-(<i>tert</i>-Butylsulfinyl)imines
作者:Juan F. Collados、Estefanía Toledano、David Guijarro、Miguel Yus
DOI:10.1021/jo300919x
日期:2012.7.6
environmentally friendly, and very efficient procedure for the synthesis of opticallypureN-(tert-butylsulfinyl)imines has been developed with microwave-promoted condensation of aldehydes and ketones using (R)-2-methylpropane-2-sulfinamide in the presence of Ti(OEt)4, under solvent-free conditions. This procedure allows for the preparation of a variety of sulfinyl aldimines with excellent yields and purities
Modular Stereocontrolled Assembly of R<sub>2</sub>Zn, Cyclic Enones and <i>N</i>-<i>tert</i>-Butanesulfinyl Imines
作者:José C. González-Gómez、Francisco Foubelo、Miguel Yus
DOI:10.1021/jo802812w
日期:2009.3.20
The assembly of a wide range of dialkylzincs, cyclic enones, and chiral N-tert-butylsulfinyl imines in the presence of the appropriate phosphoramidite ligands allowed the formation of β-amino ketones with three consecutive stereogenic centers in a stereocontrolled manner. The Baeyer−Villiger oxidation of the resulting aminoketones led to the corresponding aminolactones with excellent regio- and stereoselectivities