Enantioselective Synthesis of Cyclic Amides and Amines through Mo-Catalyzed Asymmetric Ring-Closing Metathesis
作者:Elizabeth S. Sattely、G. Alexander Cortez、David C. Moebius、Richard R. Schrock、Amir H. Hoveyda
DOI:10.1021/ja051330s
日期:2005.6.1
investigations, a catalyticasymmetric method for highly enantioselective (up to 97% ee) synthesis of small- and medium-ring unsaturated cyclic amines is reported; optically enriched products bear a secondary amine or a readily removable Cbz or acetamide unit. Regio- and diastereoselective functionalizations of olefins within the optically enriched amine products have been carried out. Both catalytic asymmetric
首先,报道了一种合成光学富集的 N 稠合双环结构的有效方法。通过 Mo 催化的非手性多烯底物的去对称化,可以合成 5,6-、5,7- 和 5,8- 双环酰胺,ee 高达 >98%。详细检查和讨论了催化剂结构、烯烃取代、路易斯碱性官能团的定位和环尺寸的影响。在研究的第二阶段,报道了一种用于高度对映选择性(高达 97% ee)合成中小环不饱和环胺的催化不对称方法;光学富集的产品带有仲胺或易于去除的 Cbz 或乙酰胺单元。已经在光学富集的胺产品中进行了烯烃的区域选择性和非对映选择性官能化。两种催化不对称方法都包括导致形成三取代和二取代环状烯烃的转化。本文概述的方案提供了各种高光学纯度的环胺;此类产品不易通过替代方案获得,可用于生物活性分子的对映选择性全合成。
New growth regulators of corn based on N-mono- and N,N-bis-3-butenyldichloroacetamides
作者:Yu. N. Bubnov、Yu. Ya. Spiridonov、N. Yu. Kuznetsov
DOI:10.1007/s11172-018-2080-0
日期:2018.2
Allylboration of imines, nitriles (including hydrocyanic acid), amides, lactams, aromatic azaheterocycles (pyridines, isoquinoline, and pyrrole) was used to synthesize a series of mono- and bis-3-butenylamines with different structures, which were converted to dichloroacetamides, new analogs of a known safener (herbicide antidote) Dichlormid successfully used in the cultivation of corn throughout the
New enolate-carbodiimide rearrangement in the concise synthesis of 6-amino-2,3-dihydro-4-pyridinones from homoallylamines
作者:N. Yu. Kuznetsov、R. M. Tikhov、I. A. Godovikov、V. N. Khrustalev、Yu. N. Bubnov
DOI:10.1039/c6ob00293e
日期:——
Three-step synthesis of 6-amino-2,3-dihydro-4-pyridinones from homoallylamines involving NBS (or I2, PhSeCl)-mediated cyclization of N-(3-butenyl)ureas to 6-(bromomethyl)-2-iminourethanes, dehydrohalogenation and the novel enolate-carbodiimide rearrangement as a key step has been developed. The...
Radical Allylation, Vinylation, Alkynylation, and Phenylation Reactions of α-Halo Carbonyl Compounds with Organoboron, Organogallium, and Organoindium Reagents
reactions of α-halo carbonyl compounds with alkenylindium proceeded via a radical process in the presence of triethylborane. Unactivated alkene moieties and styryl groups were introduced by this method. The carbon-carbon double bond geometry of the alkenylindiums was retained during the alkenylation. Preparation of an alkenylindium via a hydroindation of 1-alkyne and subsequent radical alkenylation established
Total Synthesis of Gambierol: The Generation of the A–C and F–H Subunits by Using a C-Glycoside Centered Strategy
作者:Utpal Majumder、Jason M. Cox、Henry W. B. Johnson、Jon D. Rainier
DOI:10.1002/chem.200500993
日期:2006.2.8
Gambierol, a representative of the marine ladder toxin family, consists of eight ether rings, 18 stereocenters, and two challenging pyranyl rings having methyl groups that are in a 1,3-diaxial orientation to one another. Herein we describe the generation of gambierol's A-C and F-H ring systems and demonstrate the versatility of the glycosyl anhydride, enol ether-olefin RCM strategy to fused polycyclic