Nickel/Bis(oxazoline)-Catalyzed Asymmetric Negishi Arylations of Racemic Secondary Benzylic Electrophiles to Generate Enantioenriched 1,1-Diarylalkanes
作者:Hien-Quang Do、E. R. R. Chandrashekar、Gregory C. Fu
DOI:10.1021/ja408561b
日期:2013.11.6
A tertiary stereogenic center that bears two different aryl substituents is found in a variety of bioactive compounds, including medicines such as Zoloft and Detrol. We have developed an efficient method for the synthesis of enantioenriched 1,1-diarylalkanes from readily available racemic benzylic alcohols. Formation of a benzylic mesylate (which is not isolated), followed by treatment with an arylzinc reagent, LiI, and a chiral nickel/bis(oxazoline) catalyst, furnishes the Negishi cross-coupling product in high ee and good yield. A wide array of functional groups (e.g., an aryl iodide, a thiophene, and an N-Boc-indole) are compatible with the mild reaction conditions. This method has been applied to a gram-scale synthesis of a precursor to Zoloft.
Preparation of optically active 2-furylcarbinols by kinetic resolution using the Sharpless reagent and their application in organic synthesis
作者:Masato Kusakabe、Yasunori Kitano、Yuichi Kobayashi、Fumie Sato
DOI:10.1021/jo00270a015
日期:1989.4
KUSAKABE, MASATO;KITANO, YASUNORI;KOBAYASHI, YUICHI;SATO, FUMIE, J. ORG. CHEM., 54,(1989) N, C. 2085-2091