Amino Acids and Peptides; 581Synthesis of Optically Active 2-(1-Hydroxyalkyl)-thiazole-4-carboxylic Acids and 2-(1-Aminoalkyl)-thiazole-4-carboxylic Acids
3-Aminoquinazoline–phosphine ligands and their ruthenium(II) complexes: application in catalytic hydrogenation and transfer hydrogenation reactions
作者:Mustafa Kemal Yılmaz、Mustafa Keleş
DOI:10.1007/s11243-018-0213-9
日期:2018.4
and microanalysis. The 3-aminoquinazolinone–phosphine ligands were found to coordinate with the Ru(II) center via their phosphorus and nitrogen atoms. The Ru(II) complexes were applied as catalysts for the hydrogenation and transferhydrogenation of prochiral ketones. The results showed that these complexes are efficient transferhydrogenation catalysts.
Asymmetrische Synthesen über heterocyclische Zwischenstufen, XVI. Enantioselektive Synthese von α-Alkyl-α-phenylglycinen durch Alkylieren von an C-6 chiral substituierten 3,6-Dihydro-3-phenyl-2H-1,4-oxazin-2-onen
作者:Wolfgang Hartwig、Ulrich Schöllkopf
DOI:10.1002/jlac.198219821105
日期:1982.11.22
Ausgehend von DL-Phenylglycin und (S)-2-Hydroxyalkansäuren 4 werden die 3,6-Dihydro-3-phenyl-2H-1,4-oxazin-2-one 3 aufgebaut, die an C-6 ein endocyclisches Chiralitätszentrum besitzen. Die Anionen 10 von 3 reagieren mit Alkylhalogeniden an C-3 mit guten chemischen Ausbeuten und mit 50 bis mehr als 95% d. e. (asymmetrische Induktion). Bei der Hydrolyse der Addukte 11 werden die 2-Hydroxyalkansäuren
从DL-苯基甘氨酸和(S)-2-羟基链烷酸4开始,构建了3,6-二氢-3-苯基-2 H -1,4-恶嗪-2-酮3,它们的内环中心为C-6的手性。阴离子10的3与烷基卤化物反应,在C-3具有良好的化学产率,并用50至95%以上的德(不对称诱导)。在加合物11的水解过程中,释放出2-羟基链烷酸4和旋光的(S)-α-烷基-α-苯基甘氨酸14。
Electrogenerated chiral building blocks for diastereoselective amidoalkylation reactions
Three different electrochemical methods have been applied for the synthesis of chiral building blocks for diastereoselective amidoalkylation reactions. These are A. the direct anodic α-methoxylation of amides and carbamates; B. anodic methoxylative decarboxylation of α-amino acid derivatives (Hofer-Moest reaction) C. indirect NaCl mediated anodic α-methoxylation of α-amino acid derivatives. The application of these building blocks for the synthesis of enantiomerically pure α-amino acids, dichiral 1,2-amino alcohols and chiral 1,3-diamines is described.
propargylic alcohols are important chiral-building blocks in asymmetric synthesis, while the asymmetric addition of a terminal alkyne to an aldehyde is one of the most important procedures to prepare these chiral-building blocks. In this work, a family of chiral 4,4′-biquinazoline alcohols has been conveniently prepared from the easily accessible (S)-2-acetoxycarboxylic acid chlorides by reaction sequences
光学活性的炔丙醇是不对称合成中的重要手性结构单元,而末端炔烃不对称加成到醛中是制备这些手性结构单元的最重要方法之一。在这项工作中,通过反应顺序,从缩合反应开始,然后进行关键的合成步骤,包括氯化,镍(0),这是很容易从易于获得的(S)-2-乙酰氧基羧酸氯化物制备的手性4,4'-联喹唑啉醇家族介导的均偶联和脱保护作用,此外还考虑了将苯基乙炔对醛进行对映选择性加成时可能的配体。这些手性配体可以与Ti(O i Pr)4结合然后用于催化由乙炔与二乙基锌反应原位生成的乙炔锌不对称加成到醛中。在这项研究中获得的最佳对映体过量为75%。
Synthesis and Anticancer Activity of Structure Simplified Naturally Inspired Dimeric Chromenone Derivatives
作者:Rameez Ali、Yong Guan、Alexandria N. Leveille、Elizabeth Vaughn、Sangram Parelkar、Paul R. Thompson、Anita E. Mattson
DOI:10.1002/ejoc.201901026
日期:2019.11.10
A focused family of naturally inspired chromenone dimers has been synthesized and studied for anticancer activity. Select dimeric chromenones prepared in this study have were found to have moderate cytotoxicity toward L5178Y and HL60 cells. These compounds may serve as promising leads for the identification of new ligands and biological targets.