发现了由K 2 S 2 O 8和可见光光氧化还原催化介导的可见光照射串联氧化芳基迁移/羰基形成反应。所提出的转化提供了以伴随羰基形成的1,4-芳基转移的区域选择性方式从容易获得的均炔醇衍生物直接获得重要的α-丙二烯醛/酮衍生物。操作简单和底物范围广泛表明该方法在合成高功能α-丙二烯醛/酮衍生物方面具有巨大潜力。
发现了由K 2 S 2 O 8和可见光光氧化还原催化介导的可见光照射串联氧化芳基迁移/羰基形成反应。所提出的转化提供了以伴随羰基形成的1,4-芳基转移的区域选择性方式从容易获得的均炔醇衍生物直接获得重要的α-丙二烯醛/酮衍生物。操作简单和底物范围广泛表明该方法在合成高功能α-丙二烯醛/酮衍生物方面具有巨大潜力。
TBAI/K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>Initiated Radical Cyclization to Synthesize<i>β</i>- Arylsulfonyl Naphthalenes from Homopropargylic Alcohols and Sulfonyl Hydrazides
作者:Xiaodong Yang、Lianbiao Zhao、Bingxiang Yuan、Zhenjie Qi、Rulong Yan
DOI:10.1002/adsc.201700634
日期:2017.9.18
metal‐free radical addition method for the synthesis of β‐arylsulfonyl naphthalenes with homopropargylic alcohols and sulfonyl hydrazides has been developed. In this reaction, sulfonyl hydrazide is employed as the source of sulfonyl radical to produce the desired sulfone directly. There is the first example for homopropargylic alcohol through direct intramolecular addition of vinyl radical to arenes
开发了一种金属自由基加成法,用高炔丙醇和磺酰肼合成β-芳基磺酰基萘。在该反应中,使用磺酰肼作为磺酰基的来源,以直接生产所需的砜。第一个例子是通过由TBAI / K 2 S 2 O 8反应系统引发的乙烯基与磺酰基基团直接向芳烃中分子内加成乙烯基炔醇,并以中等收率产生所需的产物。
Highly Selective and Switchable Access to Tetrasubstituted Alkenyl Sulfones and Naphthyl Sulfones: 1,4-Aryl Migration versus Cyclization
A highly efficient, chemo-, and regioselective approach has been developed for the switchable synthesis of tetrasubstituted alkenyl sulfones and naphthyl sulfones from homopropargylic alcohols via sulfonylation/1,4-aryl migration and sulfonylation/cyclization. The present switchable processes are characterized by mild and metal-free conditions, high selectivities, good functionalgroup tolerance, the
A novel copper‐catalyzed one‐pot functionalization of homopropargylic alcohols that involves trifluoromethylation, aryl migration, and formation of a carbonyl moiety has been developed. This reaction constitutes the first direct conversion of homopropargylic alcohols into CF3‐containing 3‐butenal or 3‐buten‐1‐one derivatives in a regioselective manner. Mechanistic studies indicate that the 1,4‐aryl
Palladium-Catalyzed One-Pot Conversion of Aldehydes and Ketones into 4-Substituted Homopropargyl Alcohols and 5-En-3-yn-1-ols
作者:Christian A. Umaña、Jorge A. Cabezas
DOI:10.1021/acs.joc.7b01529
日期:2017.9.15
of 1,3-dilithiopropyne, which adds regiospecifically to aldehydes and ketones to produce homopropargyl alcohols. The lithium acetylide intermediate formed in this protocol can be further reacted with aromatic and vinyl halides, under palladium catalysis, to produce 4-substituted homopropargyl alcohols and 5-en-3-yn-1-ols, respectively, in one-pot with good overall yields.