Stereospecific Synthesis of β-Lactams from Heterocyclic Imines Using the Staudinger Reaction
作者:T. Stalling、K. Johannes、S. Polina、J. Martens
DOI:10.1002/jhet.1688
日期:2013.5
The reactions of the heterocyclicimines 5,6‐dihydro‐2H‐[1,3]oxazines and 2H‐1,4‐benzothiazines with different substituted acetyl chlorides in the presence of triethylamine forming β‐lactams were examined focusing on the stereochemistry of the Staudingerreaction.
在形成三乙胺的β-内酰胺存在下,研究了杂环亚胺5,6-二氢-2 H- [1,3]恶嗪和2 H -1,4-苯并噻嗪与不同取代的乙酰氯的反应施陶丁格反应的过程。
Three-Component Reaction toward Polyannulated Quinazolinones, Benzoxazinones, and Benzothiazinones
take part in nucleophilic aromatic substitution (SNAr) reactions is realized in a new three-component, one-pot reaction, giving at least tricyclic annulated quinazolinones, benzoxazinones, and benzothiazinones as a result of the employed nitrogen, oxygen, or sulfur nucleophiles, respectively. Especially in the case of quinazolinones, this convenient strategy enables the access to heterocycles of heightened
在新的三组分一锅法反应中,实现了易于参与的环状亚胺与酰基氯的有效转化,该亚胺能够参与亲核芳香族取代(S N Ar)反应,至少产生三环环化喹唑啉酮,苯并恶嗪酮分别是由于使用了氮,氧或硫亲核试剂而产生的苯并噻嗪酮。特别是在喹唑啉酮的情况下,这种方便的策略使人们能够进入多样性更高的杂环,这为精细杂环骨架的有效衍生化提供了发展。在随后的Heck或Ullmann环化中,可以对所提及的喹唑啉酮进行进一步的环合。
Rearrangement in the Synthesis of Annulated Lactams Starting from Benzothiazines
作者:Timo Stalling、Wolfgang Saak、Jürgen Martens
DOI:10.1002/ejoc.201300768
日期:2013.10
the one hand, different types of unknown lactam systems with and without a rearrangement under ring contraction of the benzothiazine substructure were selectively obtained. In this investigation, annulated lactams without ring contraction were formed by oxidation of the sulfide group to a sulfone group in the benzothiazine skeleton. On the other hand, benzothiazoles, which are oxidation products, were
基于亚胺 1,4-苯并噻嗪的甲氧基酰胺的转化根据取代模式产生了三种不同的产品。一方面,选择性地获得了不同类型的未知内酰胺体系,在苯并噻嗪亚结构的环收缩下有和没有重排。在这项研究中,没有环收缩的环状内酰胺是通过将硫化物基团氧化成苯并噻嗪骨架中的砜基团而形成的。另一方面,分离出氧化产物苯并噻唑。所有类型内酰胺的结构均通过 X 射线衍射验证。
Stereocontrolled 1,3-Phosphatyloxy and 1,3-Halogen Migration Relay toward Highly Functionalized 1,3-Dienes
作者:Roohollah Kazem Shiroodi、Alexander S. Dudnik、Vladimir Gevorgyan
DOI:10.1021/ja301243t
日期:2012.4.25
A double migratory cascade reaction of α-halogen-substituted propargylic phosphates to produce highly functionalized 1,3-dienes has been developed. This transformation features 1,3-phosphatyloxy group migration followed by 1,3-shifts of bromine and chlorine as well as the unprecedented 1,3-migration of iodine. The reaction is stereodivergent: (Z)-1,3-dienes are formed in the presence of a copper catalyst
The Mukaiyama reaction of ketene bis(trimethylsilyl) acetals with α-halo acetals
作者:F.W.J. Demnitz
DOI:10.1016/s0040-4039(01)93317-9
日期:——
Ketene bis(trimethylsilyl) acetals were reacted with α-halo acetals giving β-alkoxy-γ-halo acids which were converted to butenolides by reaction with two equivalents of base. This constitutes a novel and short butenolide synthesis.