Selective Reductions. 59. Effective Intramolecular Asymmetric Reductions of α-, β-, and γ-Keto Acids with Diisopinocampheylborane and Intermolecular Asymmetric Reductions of the Corresponding Esters with <i>B</i>-Chlorodiisopinocampheylborane
作者:P. Veeraraghavan Ramachandran、Sangeeta Pitre、Herbert C. Brown
DOI:10.1021/jo025594y
日期:2002.7.1
stereochemistry of the products obtained from the intramolecular asymmetric reduction of a series of ketoacids with (-)-diisopinocampheylborane and intermolecular asymmetric reduction of the corresponding series of ketoesters with (-)-B-chlorodiisopinocampheylborane ((-)-DIP-Chloride) has been made. The stereochemistry of the hydroxy acidsfrom the reduction of ketoacids is dependent only on the enantiomer
Asymmetric reduction of the prochiral carbonyl group of aliphatic .gamma.- and .delta.-keto acids by use of fermenting bakers' yeast
作者:Masanori Utaka、Hisashi Watabu、Akira Takeda
DOI:10.1021/jo00228a039
日期:1987.9
Efficient Intramolecular Asymmetric Reductions of α-, β-, and γ-Keto Acids with Diisopinocampheylborane<sup>1</sup>
作者:P. Veeraraghavan Ramachandran、Herbert C. Brown、Sangeeta Pitre
DOI:10.1021/ol0062291
日期:2001.1.1
[GRAPHICS]alpha-, beta-, and gamma -Keto acids are reduced with diisopinocampheylborane at room temperature to the corresponding hydroxy acids with predictable stereochemistry in very high ee. The gamma -hydroxy acids produced were conveniently cyclized to the corresponding lactones, This provides a simple synthesis of 4-hexanolide, a component of the pheromone secreted by the female dermestid beetle Trogoderma glabrum.
Yadav, J. S.; Rao, Sreenivasa E.; Rao, Sreenivasa V., Synthetic Communications, 1989, vol. 19, # 3and4, p. 705 - 712
作者:Yadav, J. S.、Rao, Sreenivasa E.、Rao, Sreenivasa V.