An improved and efficient electrochemical N-acylation of chiraloxazolidin-2-ones has been achieved. The generation of the nitrogen anion is obtained under mild conditions and without addition of base or probase, by direct electrolysis of a solution of MeCN-TEAP containing the oxazolidinone. Acylation agents (acid chlorides or anhydrides) were added at the end of the electrolysis. N-Acylated products
Stereoselective Formation of <i>N</i>-Acyliminium Ion via Chiral <i>N</i>,<i>O</i>-Acetal TMS Ether and Its Application to the Synthesis of <i>β</i>-Amino Acids
see text] The highlystereoselectivesynthesis of beta-amino acids via the chiral 4-phenyloxazolidinone-controlled linear N-acyliminium ion reaction has been achieved by employing chiral N,O-acetal TMS ethers. In addition, the mechanism of the excellent stereochemical outcome has been elucidated. The oxazolidinone auxiliary plays a dual role in stereocontrol: the E/Z geometry control of the N-acyliminium
Practical Formal Total Syntheses of the Homocamptothecin Derivative and Anticancer Agent Diflomotecan via Asymmetric Acetate Aldol Additions to Pyridine Ketone Substrates
scalable asymmetric routes to DE ring fragment 7, a key building block in the synthesis of the homocamptothecin derivative diflomotecan 4, are described. The “acetal route” starts from 2-chloro-4-cyanopyridine 8 and represents an enantioselective and optimized modification of the original racemic discovery chemistry synthesis. The inefficient optical resolution procedure was replaced by an efficient asymmetric
[EN] NECROSIS INHIBITORS<br/>[FR] INHIBITEURS DE NÉCROSE
申请人:NAT INST OF BIOLOG SCIENCES BEIJING
公开号:WO2016101887A1
公开(公告)日:2016-06-30
The invention provides amides that inhibit cellular necrosis and/or human receptor interacting protein 1 kinase (RIP1), including corresponding sulfonamides, and pharmaceutically acceptable salts, hydrides and stereoisomers thereof. The compounds are employed in pharmaceutical compositions, and methods of making and use, including treating a person in need thereof with an effective amount of the compound or composition, and detecting a resultant improvement in the person's health or condition.
Enantioselective Synthesis of Four Natural Homoisoflavonoids
作者:Yan-Chao Yu、Shijun Zhu、Xiao-Wei Lu、Yikang Wu、Bo Liu
DOI:10.1002/ejoc.201500579
日期:2015.8
Four naturally occurring sappanin-type homoisoflavonoids were synthesized in optically active form with the stereogenic centers of predefined absolute configuration constructed by using Evans' asymmetric aldol reaction. Analysis of the synthesized compounds not only confirmed the previously assigned planar structures but also was used to determine the absolute configurations of the natural products