Delavatine A 的 Enantiospecific 全合成和 Incarviatone A 的正式合成的统一策略
摘要:
我们描述了一种受对称启发的合成方法,该方法使 delavine A 的短合成和 incarviatone A 的正式合成成为可能,这是两种可能与生物合成相关的天然产物。这些天然产品的茚满核心是通过级联序列构建的,涉及在单个罐中发生的五个转化。利用对称性,我们可以将这两种天然产物追溯到多功能构件 3,5-二溴-2-吡喃酮,并描述了与该多卤化杂环的位点选择性交叉偶联相关的研究。此外,我们的策略提供了一种假定的生物遗传前体,从中尝试合成两种天然产物。
Regioselective Stille coupling reactions of 3,5-dibromo-2-pyrone with various aryl and vinyl stannanes
作者:Won-Suk Kim、Hyung-Jin Kim、Cheon-Gyu Cho
DOI:10.1016/s0040-4039(02)02305-5
日期:2002.12
regioselective Stille coupling reactions with aryl, heteroaryl and vinyl stannanes to produce various 3-substituted, 5-bromo-2-pyrones. Addition of a catalytic amount of CuI greatly increased the selectivity and chemical yield of the desired 3-aryl-5-bromo-2-pyrone. Second Stille coupling reactions on the resulting 3-aryl-2-pyrones gave rise to a series of potentially useful 2-pyrones with two different functionalities
Regioselectivity in the Stille Coupling Reactions of 3,5-Dibromo-2-pyrone
作者:Won-Suk Kim、Hyung-Jin Kim、Cheon-Gyu Cho
DOI:10.1021/ja037043a
日期:2003.11.1
C3, lower in electron density than C5, thus oxidative addition proceeds faster . When the reactions are carried out with Cu(I) in DMF or other polar aprotic solvent, however, the couplings occur predominantly at C5. The observed regiochemical reversal is attributed to the preferred formation of 5-pallado-2-pyrone intermediate which, in addition, turned out to be more reactive than 3-pallado-2-pyrone
Regiocontrolled Suzuki-Miyaura Couplings of 3,5-Dibromo-2-pyrone
作者:Cheon-Gyu Cho、Ki-Moon Ryu、Arun Kumar Gupta、Jin Wook Han、Chang Ho Oh
DOI:10.1055/s-2004-831311
日期:——
In a similar way to its Stille coupling reactions, 3,5-dibromo-2-pyrone undergoes the Suzuki-Miyaura coupling reactions at either the C3- or the C5-position with high regioselectivity depending on the reaction conditions.
A Short Synthesis of Delavatine A Unveils New Insights into Site-Selective Cross-Coupling of 3,5-Dibromo-2-pyrone
作者:Vignesh Palani、Cedric L. Hugelshofer、Ilia Kevlishvili、Peng Liu、Richmond Sarpong
DOI:10.1021/jacs.8b13012
日期:2019.2.13
The recognition of latent symmetry in delavatine A has enabled a short synthesis of the natural product starting from 3,5,dibromo-2-pyrone. The concise synthetic route features a cascade process involving a 6 pi electrocyclization to construct the indane core of delavatine A. In addition, we have conducted detailed experimental and computational studies to gain an in-depth understanding of the mechanism of the observed site-selective cross-coupling of 3,5-dibromo-2-pyrone. This insight may provide new avenues to achieve the selective cross-coupling of multiply halogenated heteroarenes.