Novel and Efficient Synthesis of Iminocoumarins via Copper-Catalyzed Multicomponent Reaction
作者:Sun-Liang Cui、Xu-Feng Lin、Yan-Guang Wang
DOI:10.1021/ol061685w
日期:2006.9.1
A variety of substituted iminocoumarins are prepared in good to excellent yields via a copper-catalyzed multicomponenet reaction of sulfonyl azides, terminalalkynes, and salicylaldehydes or o-hydroxylacetophenones. The method is general, mild, versatile, and efficient. A plausible mechanism for the domino process is proposed.
Fused oxacycle synthesis via radical cyclization of β-alkoxyacrylates
作者:Eun Lee、Jin Sung Tae、You Hoon Chong、Yong Cheol Park、Mikyung Yun、Sangsoo Kim
DOI:10.1016/0040-4039(94)88181-2
日期:1994.1
β-Alkoxyacrylates are efficient radical acceptors in intramolecular addition of O-stannyl ketyls. This cyclization reaction can be applied reiteratively to form fused oxacycles.
Diastereoselective synthesis of 3,3-disubstituted 3-nitro-4-chromanone derivatives as potential antitumor agents
作者:Huiqing Chen、Jia Xie、Dong Xing、Jinping Wang、Jie Tang、Zhengfang Yi、Fei Xia、Wen-Wei Qiu、Fan Yang
DOI:10.1039/c8ob02761g
日期:——
protocol, a series of 3,3-disubstituted 3-nitro-4-chromanones were synthesized in good to excellent yields with high diastereoselectivities and showed moderate to good in vitro antitumor activities, representing promising antitumor hits for further drug discovery.
我们报告了一种高效和高度非对映选择性的协议,可通过不饱和酯单元的α-硝基芳基酮的分子内迈克尔型环化来快速构建3-硝基取代的4-苯并二氢吡喃酮。发现催化量的KO t Bu对于该转化的高非对映选择性控制至关重要。通过该方案,可以高收率和优异的合成率合成具有高非对映选择性的一系列3,3-二取代的3-硝基-4-苯并二氢呋喃酮,并显示出中等至良好的体外抗肿瘤活性,代表了有望用于进一步药物开发的抗肿瘤药物。
Enantioselective Intramolecular Crossed Rauhut–Currier Reactions through Cooperative Nucleophilic Activation and Hydrogen‐Bonding Catalysis: Scope and Mechanistic Insight
A highly efficient and enantioselectiveintramolecularcrossedRauhut–Currier (RC) reaction of nitroolefins with tethered enonates has been developed throughcooperativenucleophilicactivation and a hydrogen‐bonding catalytic strategy (≤98 % ee and 98 % yield). The reaction features simple experimental procedures and is completely chemoselective and atom‐economic in character. The potential synthetic
Intramolecular Tandem Seleno-Michael/Aldol Reaction: A Simple Route to Hydroxy Cyclo-1-ene-1-carboxylate Esters
作者:Piotr Banachowicz、Jacek Mlynarski、Szymon Buda
DOI:10.1021/acs.joc.8b01853
日期:2018.9.21
Intramolecular tandem seleno-Michael/aldol reaction followed by an oxidation–elimination process can be an efficient tool for the construction of hydroxy cyclo-1-ene-1-carboxylate esters from oxo-α,β-unsaturated esters. Generation of lithium selenolate from elemental selenium and n-BuLi provides a simple and efficient one-pot access to cyclic endo-Morita–Baylis–Hillman adducts.