Iodine(V) Reagents in Organic Synthesis. Part 1. Synthesis of Polycyclic Heterocycles via Dess−Martin Periodinane-Mediated Cascade Cyclization: Generality, Scope, and Mechanism of the Reaction
作者:K. C. Nicolaou、P. S. Baran、Y.-L. Zhong、K. Sugita
DOI:10.1021/ja012124x
日期:2002.3.1
reaction of unsaturated anilides discovered during the total synthesis of the CP-molecules (phomoidrides A and B) are delineated. A plethora of heterocyclic compounds are accessible by employing gamma,delta-unsaturated amides (derived fromanilines and carboxylic acids), urethanes, or ureas (derived from isocyanates and allylic alcohols and amines) as substrates. Optimization of the reaction led to room-temperature
描述了在 CP 分子(phomoidrides A 和 B)的全合成过程中发现的不饱和苯胺的 Dess-Martin periodinane 介导的环化反应的范围、一般性和机制。通过使用γ,δ-不饱和酰胺(衍生自苯胺和羧酸)、氨基甲酸酯或脲(衍生自异氰酸酯和烯丙醇和胺)作为底物,可以获得大量杂环化合物。反应的优化导致室温条件,而同位素标记研究为这种级联反应提供了机械原理。
(R)- or (S)-4-(3-hydroxy-4,4-dimethyl-2-oxopyrrolidin-1-yl)benzoic acid as a new chiral auxiliary for solid phase asymmetric Diels–Alder reactions
The synthesis of enantiopure (R)- and (S)-4-(3-hydroxy-4,4-dimethyl-2-oxopyrrolidin-1-yl)benzoic acid is described and the corresponding supported chiral acrylate derivative has been used as a dienophile in solid phase asymmetricDiels–Alderreactions with different dienes. In all cases, the reaction gave the expected compound in good yield and with high regio or endo selectivity. Moreover, a high
Etude de la reactivite des adduits acides α,β-insatures/borane dans diverses reactions Diels-Alder
Etude de la reactive des adduits acides α,β-insatures/borane dans different reactors Diels-Alder
Dehydro-aromatization of cyclohexene-carboxylic acids by sulfuric acid: critical route for bio-based terephthalic acid synthesis
作者:Fei Wang、Zhaohui Tong
DOI:10.1039/c3ra46670a
日期:——
A novel dehydro-aromatization reaction under mild reaction conditions was successfully developed using sulfuric acid as a cost-effective and efficient oxidant. This reaction simplified the synthesis of terephthalic acid (TA, an important aromatic monomer precursor) from biomass-derived isoprene and acrylic acid.
Toward Diels−Alder Reactions on a Solid Support Using Polymer BoundN-Substituted 3-Hydroxy-4,4-dimethyl-2-pyrrolidinone Acrylate Derivatives
作者:Rhalid Akkari、Monique Calmès、Jean Martinez
DOI:10.1002/ejoc.200400019
日期:2004.6
Several N-substituted 3-hydroxy-4,4-dimethyl-2-pyrrolidinone acrylate derivatives, selected to allow their attachment to a polymer, have been prepared and tested as dienophiles in the Diels−Alderreaction. The experiments, performed under TiCl4 catalysis in solution or the solid phase with isoprene and cyclopentadiene as dienes, pointed out the difficulties associated with some of these compounds that