我们发现,最近在我们实验室中发现的恶氮丙啶介导的铜催化氨基羟基化反应在卤化物添加剂的存在下显着加速。使用这种活性更高的催化剂体系可以实现电子和空间失活苯乙烯的有效氨基羟基化,并且还可以使用非立体的 3,3-二烷基氧氮丙啶作为氨基羟基化反应中的末端氧化剂。我们提供的证据表明阴离子卤铜酸盐 (II) 复合物是催化活性物质,负责在这些条件下增加反应性。这一出人意料的观察使我们重新评估了我们对这种反应的机制理解。根据各种自由基捕获实验的结果,我们提出了一种改进的机制,该机制涉及烯烃与铜(II)活化的恶氮丙啶的均裂反应。总之,观察到阴离子添加剂显着提高了氧氮丙啶的氧化能力,并且认识到在这些条件下氧氮丙啶反应的自由基性质表明,由卤铜酸盐(II)配合物催化的各种新的氧化转化应该是可能的。
我们发现,最近在我们实验室中发现的恶氮丙啶介导的铜催化氨基羟基化反应在卤化物添加剂的存在下显着加速。使用这种活性更高的催化剂体系可以实现电子和空间失活苯乙烯的有效氨基羟基化,并且还可以使用非立体的 3,3-二烷基氧氮丙啶作为氨基羟基化反应中的末端氧化剂。我们提供的证据表明阴离子卤铜酸盐 (II) 复合物是催化活性物质,负责在这些条件下增加反应性。这一出人意料的观察使我们重新评估了我们对这种反应的机制理解。根据各种自由基捕获实验的结果,我们提出了一种改进的机制,该机制涉及烯烃与铜(II)活化的恶氮丙啶的均裂反应。总之,观察到阴离子添加剂显着提高了氧氮丙啶的氧化能力,并且认识到在这些条件下氧氮丙啶反应的自由基性质表明,由卤铜酸盐(II)配合物催化的各种新的氧化转化应该是可能的。
A Simple Primary Amine Catalyst for Enantioselective α-Hydroxylations and α-Fluorinations of Branched Aldehydes
摘要:
A new primary amine catalyst for the asymmetric a-hydroxylation and a-fluorination of alpha-branched aldehydes is described. The products of the title transformations are generated in excellent yields with high enantioselectivities. Both processes can be performed within short reaction times and on gram scale. The similarity in results obtained in both reactions, combined with computational evidence, implies a common basis for stereoinduction and the possibility of a general catalytic mechanism for a-functionalizations. Promising initial results in alpha-amination and alpha-chlorination reactions support this hypothesis.
[EN] CONVERGENT AND ENANTIOSELECTIVE TOTAL SYNTHESIS OF COMMUNESIN ANALOGS<br/>[FR] SYNTHÈSE TOTALE CONVERGENTE ET ÉNANTIOSÉLECTIVE D'ANALOGUES DE LA COMMUNESINE
申请人:MOVASSAGHI MOHAMMAD
公开号:WO2017197045A1
公开(公告)日:2017-11-16
A highly convergent biomimetic synthesis of a complex polycyclic scaffold has been successfully implemented. From these efforts, compounds having a structure of Formula (I) or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof, wherein R1-R8 and m, n, r, s, t, and u are as defined herein, is provided. Methods of making such compounds are also disclosed as are methods for the treatment of cancer, various infectious diseases, and abnormal cardiovascular function.
Convergent and Biomimetic Enantioselective Total Synthesis of (−)-Communesin F
作者:Stephen P. Lathrop、Matthew Pompeo、Wen-Tau T. Chang、Mohammad Movassaghi
DOI:10.1021/jacs.6b04072
日期:2016.6.22
The first biomimetic enantioselectivetotalsynthesis of (-)-communesin F based on a late-stage heterodimerization and aminal exchange is described. Our synthesis features the expedient diazene-directed assembly of two advanced fragments to secure the congested C3a-C3a' linkage in three steps, followed by a highly efficient biogenetically inspired aminal reorganization to access the heptacyclic communesin
Anionic Halocuprate(II) Complexes as Catalysts for the Oxaziridine-Mediated Aminohydroxylation of Olefins
作者:Tamas Benkovics、Juana Du、Ilia A. Guzei、Tehshik P. Yoon
DOI:10.1021/jo900902k
日期:2009.8.7
laboratories is dramatically accelerated in the presence of halide additives. The use of this more active catalyst system enables the efficient aminohydroxylation of electronically and sterically deactivated styrenes and also enables the use of nonstereogenic 3,3-dialkyl oxaziridines as terminal oxidants in the aminohydroxylation reaction. We present evidence that anionic halocuprate(II) complexes are the catalytically
我们发现,最近在我们实验室中发现的恶氮丙啶介导的铜催化氨基羟基化反应在卤化物添加剂的存在下显着加速。使用这种活性更高的催化剂体系可以实现电子和空间失活苯乙烯的有效氨基羟基化,并且还可以使用非立体的 3,3-二烷基氧氮丙啶作为氨基羟基化反应中的末端氧化剂。我们提供的证据表明阴离子卤铜酸盐 (II) 复合物是催化活性物质,负责在这些条件下增加反应性。这一出人意料的观察使我们重新评估了我们对这种反应的机制理解。根据各种自由基捕获实验的结果,我们提出了一种改进的机制,该机制涉及烯烃与铜(II)活化的恶氮丙啶的均裂反应。总之,观察到阴离子添加剂显着提高了氧氮丙啶的氧化能力,并且认识到在这些条件下氧氮丙啶反应的自由基性质表明,由卤铜酸盐(II)配合物催化的各种新的氧化转化应该是可能的。