The reaction of sodium diselenide with opticallyactive alkyl tosylates or chlorides is found to be a useful method for the synthesis of opticallyactive dialkyl diselenides. Opticallyactive monoterpene diselenides derived from menthane, carane, pinane, and bornane systems have been obtained. The influence of the terpene fragment of the obtained diselenides on the diastereomeric excess of the methoxyselenylation
Synthesis of terpenyl selenides derived from limonene, menthol, caranol, and myrtanol is described. Three methodologies for the synthesis of terpenyl selenonium salts are compared. The results of selenium-mediated epoxidation through the use of isoselenocineole derived from limonene and methyl terpenyl, phenyl terpenyl, diterpenyl selenides, and selenonium salts are presented. The influence of solvent
Asymmetric Reduction of Chiral Acetophenone Oxime Ethers to Optically Active Primary Amines
作者:Shinichi Itsuno、Kazuo Tanaka、Koichi Ito
DOI:10.1246/cl.1986.1133
日期:1986.7.5
were synthesized from Na salt of acetophenone oxime and chiral halides, tosylates, or N-tosylaziridines which were derived from β-pinene or α-amino acids. Asymmetricreduction of the chiral oxime ether with LiAlH4 or BH3·THF gave the opticallyactive primary amine.
Terpenyl tellurides—Synthesis and application in asymmetric epoxidation
作者:Jacek Ścianowski、Anna Banach、Agata J. Pacuła
DOI:10.1080/10426507.2015.1064925
日期:2016.2.1
method using sodium telluride and terpenyl tosylates. Methyl terpenyl, phenyl terpenyl, and diterpenyl tellurides were successfully used in tellurium ylide-mediated asymmetricepoxidation reaction. The best result of asymmetricepoxidation was obtained for dicaranyl telluride (d.r. cis:trans 11:89, e.r. trans 84:16).
图形摘要 摘要 这项工作展示了在甲碲酸钠或苯碲酸钠与来自对薄荷烷、carane 和蒎烷系统的适当甲苯磺酸萜烯酯反应中获得的一组新的不对称手性碲化物的合成。此外,对称的二萜碲化物是根据我们最近发表的方法使用碲化钠和甲苯磺酸萜酯制备的。甲基萜烯、苯基萜烯和二萜碲化物已成功用于碲叶立德介导的不对称环氧化反应。不对称环氧化的最佳结果是双卡兰基碲化物(dr cis:trans 11:89, er trans 84:16)。