A Novel and Efficient Tandem Aldol Condensation-Diels-Alder Reaction Pathway for the Direct Synthesis of Dehydrodecaline Derivatives
作者:M. Abaee、Mohammad Mojtahedi、Farveh Saberi、Ghazal Karimi、M. Rezaei、A. Mesbah、Klaus Harms、Werner Massa
DOI:10.1055/s-0031-1290438
日期:2012.9
An efficient direct synthesis of dehydrodecaline derivatives is reported via a tandem aldol condensation–Diels–Alder cycloaddition process under Lewis acidic conditions. Addition of dienophile moieties to conjugated dienes, formed in situ from the condensation of enone 1 with aldehydes, lead to high-yield stereoselectivesynthesis of the final endo products in relatively short time periods. Products
Remote stereocontrolled asymmetric 1,6-addition/1,4-addition cascade reactions between cyclic dienones and 2-indolinethiones
作者:Xiaohua Sun、Jie Fei、Chuncheng Zou、Min Lu、Jinxing Ye
DOI:10.1039/c6ra19916j
日期:——
Enantioselective 1,6-addition/1,4-addition cascade reactions between cyclic dienones and 2-indolnethiones have been realized, affording chiral spiro[thiopyranoindole-cyclohexanone] scaffolds facilely and efficiently.
Remote Construction of Chiral Vicinal Tertiary and Quaternary Centers by Catalytic Asymmetric 1,6‐Conjugate Addition of Prochiral Carbon Nucleophiles to Cyclic Dienones
作者:Yuan Wei、Zunwu Liu、Xinxin Wu、Jie Fei、Xiaodong Gu、Xiaoqian Yuan、Jinxing Ye
DOI:10.1002/chem.201503530
日期:2015.12.21
An unprecedented remote construction of chiral vicinal tertiary and quaternary centers by a catalytic asymmetric 1,6‐conjugateaddition of prochiral carbon nucleophiles to cyclic dienones has been developed. Both 5H‐oxazol‐4‐ones and 2‐oxindoles were found to be very efficient carbon nucleophiles in this reaction at a remote position, giving products with excellent enantio‐ and diastereoselectivities
通过将前手性碳亲核试剂催化不对称1,6-共轭加成到环状二烯酮上,已开发出前所未有的远程手性邻三级和四级中心结构。发现5 H-恶唑-4-酮和2-羟吲哚在该反应中都是非常有效的碳亲核试剂,使产物具有优异的对映异构和非对映异构选择性(ee高达99% ee,dr> 19:1 dr 5 H-恶唑-4-和2-吲哚类化合物的ee最高为97% ee和> 19:1 dr)。
Direct Catalytic Asymmetric Doubly Vinylogous Michael Addition of α,β-Unsaturated γ-Butyrolactams to Dienones
作者:Xiaodong Gu、Tingting Guo、Yuanyuan Dai、Allegra Franchino、Jie Fei、Chuncheng Zou、Darren J. Dixon、Jinxing Ye
DOI:10.1002/anie.201504276
日期:2015.8.24
An asymmetricdoublyvinylogousMichaeladdition (DVMA) of α,β‐unsaturated γ‐butyrolactams to sterically congested β‐substituted cyclic dienones with high site‐, diastereo‐, and enantioselectivity has been achieved. An unprecedented DVMA/vinylogousMichaeladdition/isomerization cascade reaction affords chiral fused tricyclic γ‐lactams with four newly formed stereocenters.
The Swern Oxidation: First example of direct oxidation of 2-pyrazolines with “activated” DMSO
作者:Naoufel Ben Hamadi、Moncef Msaddek
DOI:10.1016/j.crci.2011.05.009
日期:2011.11
Résumé 1,3-Dipolar cycloaddition of 2-diazopropane to conjugated dienes 1 and α,β-unsaturated ketones 5 is taking place regiospecifically to give cycloadduit 4 and 6. The reaction of 2-pyrazolines derivatives with dimethylsulfoxide and oxalyl chloride under Swern conditions led to a pyrazolenines 7 and 8.
1,3-Dipolar cycloaddition of 2-diazopropane to conjugated dienes 1 and α,β-unsaturated ketones 5 is taking place regiospecifically to give cycloadduit 4 and 6.在 Swern 条件下,2-吡唑啉衍生物与二甲基亚砜和草酰氯反应生成吡唑啉 7 和 8。