126455-09-2Relevant academic research and scientific papers
Reversal of Stereoselectivity in the Aldol Reaction of Boron Enolate Derived from Oppolzer's Sultam with α,α-Difluoro and α,α,α-Trifluoro Carbonyl Compounds
Iseki, Katsuhiko,Oishi, Satoshi,Kobayashi, Yoshiro
, p. 1135 - 1138 (1994)
Hexafluoroacetone causes the complete reversal of stereochemistry in the aldol reaction of boron enolate derived from Oppolzer's sultam in the absence of Lewis acids such as TiCl4.Trifluoroacetaldehyde and 2,2-difluoro-5-phenyl-1-pentanal cause partial re
Diastereo-face selectivity in the aldol reaction of boryl enolate derived from Oppolzer's sultam
Iseki, Katsuhiko,Oishi, Satoshi,Kobayashi, Yoshiro
, p. 2003 - 2008 (2007/10/03)
In the Oppolzer aldol reaction, aldehyde reacts exclusively on the Si face (C(α)-Si attack) of the double bond of the boryl enolate 2 derived from (1S,2R)-N-propionylbornane-10,2-sultam (1), providing only 3a stereoselectively. Hexafluoroacetone (4) cause
Reversal of stereoselectivity in the Evans aldol reaction of α,α-difluoro and α,α,α-trifluoro carbonyl compounds
Iseki, Katsuhiko,Oishi, Satoshi,Kobayashi, Yoshiro
, p. 71 - 84 (2007/10/02)
The Evans aldol reaction of hexafluoroacetone and trifluoroacetaldehyde causes complete reversal of diastereofacial selectivity. The boron enolate derived from N-acyloxazolidinone 2 reacts with trifluoroacetaldehyde to give anti and "non-Evans" syn aldols
Reversal of stereoselectivity in the Evans aldol reaction of α,α-difluoro and α,α,α-trifluoro carbonyl compounds
Iseki, Katsuhiko,Oishi, Satoshi,Taguchi, Takeo,Kobayashi, Yoshiro
, p. 8147 - 8150 (2007/10/02)
The Evans aldol reaction of hexafluoroacetone and trifluoroacetaldehyde causes reversal of stereoselectivity. The boron enolate derived from oxazolidinone 1 reacts with trifluoroacetaldehyde to give anti and "non-Evans" syn aldols with stereoselectivities
THE ABSOLUTE CONFIGURATIONS AT 8 And 9-CARBONS OF ADDA, AN AMINO ACID COMPONENT OF A HEPATOTOXIN, CYANOVIRIDIN RR
Tsukuda, Takuo,Kakisawa, Hiroshi,Painuly, Praba,Shimizu, Yuzuru
, p. 4245 - 4248 (2007/10/02)
The absolute configurations at 8 and 9-positions of Adda (2), a component of cyanoviridin RR isolated from Microcystis species (Cyanobacteria), have been synthetically determined as S, S.
