Convenient Synthesis of Labdane and Drimane Analogues witho‐Quinol Functionality
摘要:
The Diels-Alder reactions of 4-carbomethoxy-o-benzoquinone with substituted-1,3-dienes give high yields of the drimane and labdane analogues containing an orthoquinol moiety.
<i>C</i><sub>2</sub>-Symmetric Dinickel Catalysts for Enantioselective [4 + 1]-Cycloadditions
作者:Michael J. Behlen、Christopher Uyeda
DOI:10.1021/jacs.0c08262
日期:2020.10.14
methylenecyclopentenes, and the exocyclic alkene is generally obtained with high Z selectivity. E and Z dienes react in a stereoconvergent fashion, providing cycloadducts with the same sense of absolute stereochemistry and nearly identical ee values. This feature allows dienes that are commercially available as E/Z mixtures to be used as substrates for the cycloaddition. A DFT model for the origin of asymmetric
二镍萘啶-双(恶唑啉)催化剂促进亚乙烯基和1,3-二烯的对映选择性分子间[4 + 1]-环加成。该反应的产物是亚甲基环戊烯,通常以高Z选择性获得环外烯烃。E 和 Z 二烯以立体收敛方式反应,提供具有相同绝对立体化学意义和几乎相同 ee 值的环加合物。该特征允许将作为 E/Z 混合物市售的二烯用作环加成的底物。提供了非对称归纳起源的 DFT 模型。
Convenient synthesis of decalin systems of bioactive terpenoids
作者:Vinayak K Gore、Shailesh R Desai、T Mayelvaganan、R Padmakumar、Shreeshailkumar B Hadimani、Sujata V Bhat
DOI:10.1016/s0040-4020(01)86353-5
日期:1993.3
New analogues of bioactive terpenoids, forskolin, nimbolide, isozonarol and ambrox have been synthesized using general Diels-Alder reaction of 2-formyl-4,4-dimethyl-cyclohexa-2,5-dienone (7) with 1,2-disubstituted-1,3-dienes (8a–k) which yielded endo- & exo-adducts. The deformylation, epimerisation, angular methylation, reduction and oxidation studies on these adducts have been reported.