Intramolecular Cycloaddition Reactions of Furo[3,4-<i>b</i>]indoles for Alkaloid Synthesis
作者:Albert Padwa、Yan Zou、Bo Cheng、Hao Li、Nadale Downer-Riley、Christopher S. Straub
DOI:10.1021/jo500331j
日期:2014.4.4
esters have been carried out as an approach to the alkaloid scandine. The Cu(II)-catalyzed reaction of an α-diazo indolo diester that contains a tethered oxa-pentenyl side chain was found to give rise to a reactive benzo[c]furan which undergoes a subsequent [4 + 2]-cycloaddition across the tethered π-bond. The reaction proceeds by the initial generation of a copper carbenoid intermediate which cyclizes onto
作为生物碱scan的一种方法,已经进行了一些模型研究,这些研究涉及几种α-重氮吲哚酰胺基酯的Cu(II)-或Rh(II)催化的类胡萝卜素环化/环加成级联反应。发现含有束缚的氧杂戊烯基侧链的α-重氮吲哚二酯的Cu(II)催化反应产生了反应性苯并[ c ]呋喃,该苯并[ c ]呋喃随后在苯并[4 + 2]-环加成反应中发生反应。束缚的π键。该反应通过首先生成铜类羧甲基中间体进行,该中间体环化到相邻的羰基上以生成反应性苯并[ c]在某些情况下可以分离的呋喃。令人失望的是,即使系留的π键含有吸电子的碳甲氧基,与相关的酰氨基吲哚酯的类似反应也未能发生。似乎对于具有束缚的π键的呋喃[3,4- b ]吲哚体系的分子内环加成的几何要求对反应中心的键角施加了明显的限制,以防止发生环加成反应。但是,在束缚的链烯基重氮酰胺基吲哚酯的氮原子上引入另一个羰基似乎在反应的π-体系之间提供了更好的轨道重叠,并使所需的环加成反应发生。
NOVEL CYCLOSPORIN DERIVATIVES AND USES THEREOF
申请人:S&T Global Inc.
公开号:US20130210704A1
公开(公告)日:2013-08-15
The present invention relates to a compound of the Formula (I)):
or pharmaceutically acceptable salt thereof, wherein the symbols are as defined in the specification; a pharmaceutical composition comprising the same, a method for treating or preventing viral infections, inflammation, dry eye, central nervous disorders, cardiovascular diseases, cancer, obesity, diabetes, muscular dystrophy, and hair loss.
[EN] COMPOUNDS THAT MEDIATE PROTEIN DEGRADATION AND METHODS OF USE THEREOF<br/>[FR] COMPOSÉS QUI ASSURENT LA MÉDIATION DE LA DÉGRADATION DE PROTÉINES ET LEURS PROCÉDÉS D'UTILISATION
申请人:MONTE ROSA THERAPEUTICS INC
公开号:WO2023069720A1
公开(公告)日:2023-04-27
Described herein, in part, are compounds that mediate the degradation of cyclin-dependent kinase 2 (CDK2), and are therefore useful in the treatment of various disorders, such as cancer.
POLAR GROUP-CONTAINING COPOLYMER, RUBBER COMPOSITION AND STUDLESS TIRE
申请人:Sumitomo Rubber Industries, Ltd.
公开号:EP2404944A1
公开(公告)日:2012-01-11
The present invention provides a polar group-containing copolymer which can provide a rubber composition and a winter tire achieving the abrasion resistance, performance on ice, and handling stability on dry roads in a balanced manner. The present invention relates to a polar group-containing copolymer obtainable by copolymerizing a conjugated diene compound and a polar group-containing vinyl compound, wherein the polar group-containing vinyl compound is a compound that has a polymerizable unsaturated bond and a polar group, wherein any one of carbon atoms forming the polymerizable unsaturated bond and a carbon atom linked to the polar group are connected to each other via at least one carbon atom, and wherein a cis content of the double bond portion of the conjugated diene compound in the polar group-containing copolymer is 80 mol% or more.