General and Highly Efficient Synthesis of 2-Alkylideneazetidines and β-Lactams via Copper-Catalyzed Intramolecular N-Vinylation
摘要:
[GRAPHICS]N-Tosyl-3-halo-3-butenylamines underwent efficient Ullmann-type coupling with the catalysis of Cul/N/N'-dimethylethylenediamine to afford 2-alkylideneazetidines, which could be readily converted to the corresponding, beta-lactams by oxidation with O-3.
A mild and efficient method for the preparation of n-tosyl amides and lactams
作者:David Tanner、Peter Somfai
DOI:10.1016/s0040-4020(01)85848-8
日期:1988.1
N-tosyl amides and lactams can be prepared easily and under mild conditions by the inter- or intramolecular condensation of carboxylic acids and secondary sulfonamides. The coupling reagent used is dicyclohexyl-carbodiimide (DCC) in the presence of 4-pyrrolidinopyridine (4-PPY) and the reactions proceed readily, usually in high yield, at room temperature.
Described herein are methods for synthesizing substituted 3-piperidone compounds. Notably, substituted 3-piperidones can also be prepared in enantiopure form. The methods may allow for preparation of highly substituted piperidine cores. Also disclosed are 3-piperidone compounds and pharmaceutical compositions comprising the compounds.
N-Activated β-lactams as versatile reagents for acyl carrier protein labeling
作者:Gitanjeli Prasad、Jon W. Amoroso、Lawrence S. Borketey、Nathan A. Schnarr
DOI:10.1039/c2ob06846j
日期:——
Acylcarrierproteins are critical components of fatty acid and polyketide biosynthesis. Their primary function is to shuttle intermediates between active sites via a covalently bound phosphopantetheinearm. Small molecules capable of acylating this prosthetic group will provide a simple and reversible means of introducing novel functionality onto carrierprotein domains. A series of N-activated beta-lactams
酰基载体蛋白是脂肪酸和聚酮化合物生物合成的关键成分。它们的主要功能是通过共价结合的磷酸泛酰巯基乙胺臂在活性位点之间穿梭中间体。能够酰化该辅基的小分子将提供一种将新功能引入载体蛋白结构域的简单且可逆的方法。准备一系列 N 活化的 β-内酰胺来检查磷酸泛酰巯基乙胺-硫醇的位点特异性酰化。一般来说,发现 β-内酰胺比我们之前研究的 β-内酯更具反应性。证明了对完全取代 apo 形式的酰基载体蛋白的选择性,表明只有磷酸泛酰巯基乙胺硫醇被修饰。N-炔丙基氧羰基的结合提供了用于与荧光团和亲和标记结合的炔柄。通过与传统探针的比较,检查了这些基团在聚酮化合物生物合成关键步骤的机械询问中的效用。总而言之,我们希望本研究中描述的探针可以作为机械审讯的有价值和通用的工具。
A New Anodic C–N Bond Forming Reaction Useful to Formation of Aziridine, Azetidine, and Pyrrolidine Rings
Aziridine, azetidine, and pyrrolidine rings were formed in high yields by anodicoxidation of the corresponding dimethyl α-(ω-tosylaminoalkyl)malonates in methanol containing KI as a mediator.