Synthesis of (−)-TAN-2483A. Revision of the Structures and Syntheses of (±)-FD-211 (Waol A) and (±)-FD-212 (Waol B)
摘要:
[GRAPHICS]The structure of waol A has been revised from 1 to 6, the vinylogue of TAN-2483 A (5). Aldol reaction of 10b(c) with 2,4-hexadienal (11) affords 9b(c), which is subjected to iodoetherification with bis(sym-collidine)IPF6 to provide 8b(c). Treatment with Et3N in CH2Cl2 completes three-step syntheses of TAN-2483A (5) and waol A (6).
transformations is of interest for both academic and industrial research. Here, a benign palladium‐based catalyst system for the alkoxycarbonylation of conjugated dienes under acid‐free conditions has been developed. This atom‐efficient transformation provides straightforward access to a variety of β,γ‐unsaturated esters in good to excellent yields and often with high selectivities. As an industrially
The palladium-catalyzedregioselective alkoxycarbonylation of allenes with aliphatic alcohols allows to produce synthetically useful α,β- and β,γ-unsaturated esters in good yields. Efficient selectivity control is achieved in the presence of appropriate ligands. Using Xantphos as the ligand, β,γ-unsaturated esters are produced selectively in good yields. In contrast, the corresponding α,β-unsaturated
Stereochemical consequences in the deprotonation of enoates
作者:Paul Galatsis、Jeffrey J. Manwell、Scott D. Millan
DOI:10.1016/0040-4039(96)01144-6
日期:1996.7
A cyclic transition structure for the deprotonation of enoates was proposed to rationalize the geometry of the deconjugated olefin and the substrate reactivity patterns.
提出了一种用于烯键的去质子化的环状过渡结构,以合理化去共轭烯烃的几何形状和底物的反应模式。
Regioselective Isomerization of Terminal Alkenes Catalyzed by a PC(sp
<sup>3</sup>
)Pincer Complex with a Hemilabile Pendant Arm
作者:Sophie De‐Botton、D.Sc. Oleg A. Filippov、Elena S. Shubina、Natalia V. Belkova、Dmitri Gelman
DOI:10.1002/cctc.202001308
日期:2020.12.4
We describe an efficient protocol for the regioselective isomerization of terminal alkenes employing a previously described bifunctional Ir‐based PC(sp3)complex (4) possessing a hemilabile sidearm. The isomerization, catalyzed by 4, results in a one‐step shift of the double bond in good to excellent selectivity, and good yield. Our mechanistic studies revealed that the reaction is driven by the stepwise
[EN] PROCESS TO PREPARE EPSILON-CAPROLACTAM<br/>[FR] PROCÉDÉ POUR PRÉPARER DE L'EPSILON-CAPROLACTAME
申请人:UNIV LEIDEN
公开号:WO2014163506A1
公开(公告)日:2014-10-09
The invention is directed to a process to prepare ε-caprolactam and/or unsaturated ε-caprolactam from a pentenamide by contacting the pentenamide with a mixture of hydrogen and carbon monoxide in the presence of a solvent and a catalyst system comprising of a Group 8-10 metal and a phosphorus-donor ligand. The ligand may be a xantphos-type ligand.