Synthesis of Fused Bicyclic Aminals through Sequential Gold/Lewis Acid Catalysis
摘要:
A novel sequential catalysis by combining gold catalysis with early transition metal catalysis was developed. Biologically important bicyclo[4.n.0] aminals were obtained under very mild conditions.
ABSTRACT A protocol that carboxylicacids esterifies with the quaternary ammonium salt of deep eutectic solvent (DES) is presented, which opens a new access to ester using DES as alkylating agent, solvent, and catalyst. The reaction runs smoothly in DES without any other additives. Substituted cinnamic acids, aromaticacids, and aliphatic acids can be esterified in moderate to good yields. The advantages
摘要提出了一种羧酸与深共熔溶剂 (DES) 的季铵盐进行酯化的协议,它开辟了使用 DES 作为烷化剂、溶剂和催化剂获得酯的新途径。反应在 DES 中顺利进行,无需任何其他添加剂。取代的肉桂酸、芳香酸和脂肪酸可以以中等至良好的收率进行酯化。该反应的优点是官能团相容性好,反应过程简单。图形概要
Natural sunscreen compositions and processes for producing the same
申请人:Mitra Kumar Shankar
公开号:US20080095721A1
公开(公告)日:2008-04-24
Disclosed is a natural sunscreen composition comprising extracts of
Hedychium spicatum
and/or
Alpinia galanga
containing active sunscreen agents, the sunscreen composition devised to protect the skin from the harmful effects of short wavelength UV B rays and long wavelength UV A rays.
US7311896B2
申请人:——
公开号:US7311896B2
公开(公告)日:2007-12-25
A Colorimetric High-Throughput Screening Method for Palladium-Catalyzed Coupling Reactions of Aryl Iodides Using a Gold Nanoparticle-Based Iodide-Selective Probe
作者:Eunhye Jung、Sudeok Kim、Yong Kim、Seong Hyeok Seo、Soo Suk Lee、Min Su Han、Sunwoo Lee
DOI:10.1002/anie.201100378
日期:2011.5.2
Catching the couplings: A general and simple screening method for palladium‐catalyzed coupling reactions of aryl iodides utilizes gold nanoparticles. This assay was successfully employed in several aminations, α‐arylation of ketones, and decarboxylative couplings. 96 samples were screened in a few minutes.
A novel sequential catalysis by combining gold catalysis with early transition metal catalysis was developed. Biologically important bicyclo[4.n.0] aminals were obtained under very mild conditions.