Nucleophile-Assisted Alkene Activation: Olefins Alone Are Often Incompetent
作者:Kumar Dilip Ashtekar、Mathew Vetticatt、Roozbeh Yousefi、James E. Jackson、Babak Borhan
DOI:10.1021/jacs.6b02877
日期:2016.7.6
strategies for design of new reactions. Alkene reactivity is seen to span the range from the often overgeneralized "sophomore textbook" image of stepwise electrophilic attack on the alkene and subsequent nucleophilic bond formation, to the nucleophile-assisted alkene activation (NAAA) cases where electron donation from the nucleophilic addition partner activates the alkene for electrophilic attack. By highlighting
Whitehead, Daniel C.; Yousefi, Roozbeh; Jaganathan, Arvind, Journal of the American Chemical Society, 2010, vol. 132, p. 3298 - 3300
作者:Whitehead, Daniel C.、Yousefi, Roozbeh、Jaganathan, Arvind、Borhan, Babak
DOI:——
日期:——
Dissecting the Stereocontrol Elements of a Catalytic Asymmetric Chlorolactonization: <i>Syn</i> Addition Obviates Bridging Chloronium
作者:Roozbeh Yousefi、Kumar Dilip Ashtekar、Daniel C. Whitehead、James E. Jackson、Babak Borhan
DOI:10.1021/ja4072145
日期:2013.10.2
absolute and relative stereochemistry of addition in enantioselective chlorolactonizations of 4-phenyl-4-pentenoic acid and its related t-butyl ester, catalyzed by (DHQD)2PHAL. Predominant syn addition of the chlorenium and the nucleophile across the olefin is observed. As shown by isotopic labeling, NMR spectroscopy, and derivative studies, the two new stereocenters formed by addition across the double