A new concise and efficient synthetic method of Psammaplin A was developed. Psammaplin A was obtained with 50% overall yield in nine steps from p-hydroxybenzaldehyde and ethyl acetoacetate via Knoevenagel condensation and direct nitrosation as key steps. This method might be very efficient to construct a quite diverse library of Psammaplin A type analogs. (C) 2012 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Dehydrogenative β′-Arylation of β-Keto Esters under Aerobic Conditions: Interplay of Metal and Brønsted Acids
作者:Kai-Tai Yip、Roshan Y. Nimje、Mikko V. Leskinen、Petri M. Pihko
DOI:10.1002/chem.201201988
日期:2012.10.1
The Brønsted aids: The first dehydrogenative arylation of β‐keto esters with arenes under ambient aerobic conditions is described (see scheme). Under a PdII/Brønstedacid co‐catalytic system, regioselective arylations with alkoxylated arenes and phenols were achieved in good yields, even in gram‐scale conditions.
布朗斯台德助剂:描述了在环境好氧条件下,β-酮酯与芳烃的第一次脱氢芳基化反应(参见方案)。在Pd II /布朗斯台德酸共催化体系下,即使在克级条件下,也能以良好的收率实现烷氧基化的芳烃和苯酚的区域选择性芳基化。
Beta-ketoester compounds
申请人:Givaudan Roure (International) SA
公开号:US06222062B1
公开(公告)日:2001-04-24
The beta-ketoesters of formula I are useful as precursors for organoleptic compounds, especially for flavors, fragrances and masking agents and antimicrobial compounds.
The beta-keto esters of formula I are useful for the delivery of organoleptic compounds, especially for flavours, fragrances and masking agents and antimicrobial compounds.
The beta-keto esters of formula I are useful for the delivery of organoleptic compounds, especially for flavours, fragrances and masking agents and antimicrobial compounds.