Palladium‐Catalysed Cyclisation of
<i>N</i>
‐Alkynyl Aminomalonates
作者:Wilfried Hess、Jonathan W. Burton
DOI:10.1002/chem.201001951
日期:2010.11.2
Go around in (hetero)cycles! The palladium‐catalysed tandem cyclisation/coupling reaction of alkynyl‐ and alkenyl‐substituted aminomalonates leads to highly functionalised pyrrolidines and piperidines in good yield (see scheme). The reaction allows efficient access to a broad range of synthetically valuable building blocks.
Organic Dye-Catalyzed Intermolecular Radical Coupling of α-Bromocarbonyls with Olefins: Photocatalytic Synthesis of 1,4-Ketocarbonyls Using Air as an Oxidant
作者:Soumyadeep Roy Chowdhury、Deepak Singh、Injamam Ul Hoque、Soumitra Maity
DOI:10.1021/acs.joc.0c01985
日期:2020.11.6
α-bromocarbonyls where aerial oxygen played a role of an oxidant to install the keto-oxygen functionality. This unique process is compatible with both internal and terminal olefins and tolerates a diverse array of functional groups (ketone, ester, amide, diketones, ketoester, and malonate). This process is mild and environmentally friendly and deals with greener oxidants like oxygen, affording 1,4-ketocarbonyls as
Tandem 1,6-addition/cyclization/vinylcyclopropane rearrangement at low temperature under metal-free conditions: an approach to spiro[4.5]cyclohexadienones
作者:Zhenbo Yuan、Kuo Gai、Youzhi Wu、Jie Wu、Aijun Lin、Hequan Yao
DOI:10.1039/c7cc00677b
日期:——
A tandem 1,6-addition/cyclization/vinylcyclopropane rearrangement for the synthesis of spiro[4.5]cyclohexadienones at low temperature under metal-free conditions is reported.
Enantioselective total synthesis of (+)-rubrobramide, (+)-talaramide A, and (−)-berkeleyamide D by a skeletal diversification strategy
作者:Kosaku Tanaka、Kenichi Kobayashi、Hiroshi Kogen
DOI:10.1039/d1cc04290d
日期:——
A unified synthesis of (+)-rubrobramide, (+)-talaramide A, and (−)-berkeleyamide D was achieved from the vinylogous esters by a skeletal diversification strategy based on regioselective 5-exo or 6-endo cyclization. This report describes the first enantioselective total synthesis of (+)-rubrobramide and (+)-talaramide A. Additionally, synthetic spirocyclic lactam compounds, including (−)-berkeleyamide
(+)-rubrobramide、(+)-talaramide A 和 (-)-berkeleyamide D 的统一合成是通过基于区域选择性 5- exo或 6- end环化的骨架多样化策略从乙烯基酯中实现的。本报告描述了 (+)-rubrobramide 和 (+)-talaramide A 的首次对映选择性全合成。 此外,合成的螺环内酰胺化合物,包括 (-)-berkeleyamide D,对潜在治疗的淀粉样蛋白-β 聚集显示出中等抑制活性阿尔茨海默病。
Base-Promoted C→N Acyl Rearrangement: An Unconventional Approach to α-Amino Acid Derivatives
作者:Iratxe Ugarriza、Uxue Uria、Luisa Carrillo、Jose L. Vicario、Efraim Reyes
DOI:10.1002/chem.201402514
日期:2014.9.8
N‐alkyl aminomalonates undergo a fast and selective intramolecular C→N acylrearrangement reaction in the presence of a strong base, leading to N‐protected glycinates in excellent yield. Moreover, the fact that the reaction proceeds through a nucleophilic enolate intermediate has been used for implementing a tandem rearrangement/alkylation sequence that has been applied to the preparation of synthetically