A practical procedure of propargylation of aldehydes
作者:Papiya Ghosh、Angshuman Chattopadhyay
DOI:10.1016/j.tetlet.2012.07.021
日期:2012.9
An operationally simple procedure of propargylation of aldehydes in moist solvent (distilled THF) has been developed through direct addition of propargyl bromide to aldehyde substrates mediated with low valent iron or tin. The metals were spontaneously prepared in situ employing bimetal redox strategy. Using different aldehydes as substrates (3a–k) both these metal mediated reactions took place producing
Rh-Catalyzed cyclization of 2,3-allenoic acids in the presence of 2,3-allenols
作者:Junjie Fan、Chunling Fu、Xiaoyan Wu、Shengming Ma
DOI:10.1039/d1cc04367f
日期:——
Herein we report a [Cp*RhCl2]2-catalyzed coupling cyclization of two different classes of allenes with 2,3-allenoic acids affording 2(5H)-furanone skeletons of products and 2,3-allenols forming a conjugated (E)-enal or enone functionality to the β-position of the 2(5H)-furanones. These products are important building blocks for the syntheses of potentially bioactive compounds. The reaction proceeded
在本文中,我们报告了 [Cp*RhCl 2 ] 2催化的两种不同类型的丙二烯与 2,3-丙烯酸的偶联环化反应,提供 2(5 H )-呋喃酮骨架的产物和 2,3-丙二烯醇形成共轭 ( E )-烯醛或烯酮官能团连接到 2(5 H )-呋喃酮的 β-位。这些产品是合成潜在生物活性化合物的重要组成部分。该反应通过由铑携带的核金属化、插入和立体定义的 1,4- H传递进行。
Enzymatic Kinetic Resolution (EKR) of α-Allenols Enabled by a Commercially Available Immobilized Lipase
作者:Can Zhu、Tianyu Zhang
DOI:10.1055/s-0042-1751525
日期:——
practical EKR of α-allenols enabled by a commercially available immobilized lipase, Lipozyme TL-IM. The stereoselectivity factor (S-factor) of this kinetic resolution (KR) was investigated to reach up to >1000. The robust nature of the EKR strategy is reflected by a broad scope of α-allenol substrates with the excellent control of enantioselectivity. This method offers an alternative approach to access chiral