The beta-ketoesters of formula I are useful as precursors for organoleptic compounds, especially for flavors, fragrances and masking agents and antimicrobial compounds.
Stereoconvergent Conjugate Addition of Arylboronic Acids to α-Angelica Lactone Derivatives: Synthesis of Stereochemically Complex γ-Butyrolactones
作者:Jessica A. Griswold、Jeffrey S. Johnson
DOI:10.1021/acscatal.9b04405
日期:2019.12.6
with up to threecontiguousstereocenters. The reaction proceeds under a dynamic kineticresolution manifold by isomerizing the achiral starting material into an interconverting mixture of enantiomeric conjugate acceptors, followed by catalyst-controlled, enantiomer-selective 1,4-addition. Base-promoted racemization of the intermediate α,β-butenolide is possible due to the high kinetic and thermodynamic
Rhodium-Catalyzed Highly Enantio- and Diastereoselective Alkenylation of β,γ-Unsaturated Butenolides via Dynamic Kinetic Resolution
作者:Xiaosa Lu、Jie Zhu、Yinhua Huang
DOI:10.1021/acs.orglett.2c03551
日期:2022.12.9
diene ligand, (S,S)-Ph-bod, enables the facile synthesis of chiral butyrolactones in high yields with extremely high enantioselectivities (>99% ee in all cases) and high diastereoselectivities (up to >20:1 dr). The key process of the reaction involves the isomerization of β,γ-unsaturated butenolides to racemic α,β-unsaturated butenolides and the subsequent dynamic kinetic resolution through ligand-controlled
报道了一种铑催化的 β,γ-不饱和丁烯酸内酯的高度对映和非对映选择性烯基化反应。使用手性二烯配体 ( S , S )-Ph-bod,能够以高产率轻松合成手性丁内酯,具有极高的对映选择性(在所有情况下 >99% ee)和高非对映选择性(高达 >20: 1 博士)。反应的关键过程包括 β,γ-不饱和丁烯酸内酯异构化为外消旋 α,β-不饱和丁烯酸内酯,以及随后通过配体控制的动态动力学拆分,通过 1,4 原位生成的烯基铑物质进行对映选择性烯基化- 铑迁移。
Beta-ketoester
申请人:Givaudan Roure (International) S.A.
公开号:EP0911315A1
公开(公告)日:1999-04-28
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.