Construction of 2-Substituted-3-Functionalized Benzofurans via Intramolecular Heck Coupling: Application to Enantioselective Total Synthesis of Daphnodorin B
A novel approach was developed for the synthesis of 2-substituted-3-functionalized benzofurans, using an intramolecular Heckreaction which was further applied in the first enantioselectivetotalsynthesis of Daphnodorin B.
A new and efficient one-pot synthesis of aromatic alkynyl ketones from aromatic esters
作者:Sang Jun Yim、Chan Ho Kwon、Duk Keun An
DOI:10.1016/j.tetlet.2007.06.015
日期:2007.7
The reaction of aromaticesters with alkynyllithiums in the presence of lithium morpholinide and BF3·OEt2 gave aromatic alkynyl ketones in good yield (78–87%).
Effective Partial Alkynylation of Carboxylic Acid Derivatives to Alkynyl Ketones
作者:Sang-Jun Yim、Min-Hyeok Kim、Duk-Keun An
DOI:10.5012/bkcs.2010.31.02.286
日期:2010.2.20
The reaction of carboxylic acid derivatives such as esters, acid chlorides and acid anhydrides with alkynyl lithiums in the presence of lithium morpholinide and $BF_3\cdot}OEt_2$ gave alkynyl ketones in good yield (73-96%).
The metal-free oxidative alkene methylation/alkynylation of 1,4-enyn-3-ols with an organic peroxide as the methyl source has been developed, which provides straightforward and practical access to the challenging quaternary-carbon-containing but-3-yn-1-ones. The method is reasoned to go through methylation of functional alkenes utilizing dicumyl peroxide as the methylating reagent and subsequent intermolecular
Sunlight-Driven Decarboxylative Alkynylation of α-Keto Acids with Bromoacetylenes by Hypervalent Iodine Reagent Catalysis: A Facile Approach to Ynones
作者:Hui Tan、Hongji Li、Wangqin Ji、Lei Wang
DOI:10.1002/anie.201503479
日期:2015.7.13
A novel and practical decarboxylativealkynylation of α‐keto acids with bromoacetylenes is catalyzed by hypervalent iodine(III) reagents when irradiation by sunlight at room temperature. The product ynones are generated in good yields. Experiments show that results obtained with blue light (λ=450–455 nm) are comparable to those obtained when using sunlight. Mechanistic studies demonstrate that the