103668-44-6Relevant articles and documents
Diastereoselective reduction of β-hydroxyketones with amineboranes in the presence of lithium perchlorate
Narayana, Chatla,Reddy, M. Rama,Hair, Max,Kabalka, George W.
, p. 7705 - 7708 (1997)
The reduction of β-hydroxyketones with amineboranes in the presence of lithium perchlorate produces the corresponding anti 1,3-diols as major products.
Simple metal alkoxides as effective catalysts for the hetero-aldol-Tishchenko reaction
Mascarenhas, Cheryl M.,Duffey, Matthew O.,Liu, Shih-Yuan,Morken, James P.
, p. 1427 - 1429 (1999)
(equation presented) This paper reports the utility of simple metal alkoxides for the catalytic, stereoselective hetero-aldol-Tishchenko reaction (eq 1). Choice of metal alkoxide is crucial to achieving high efficiency and stereoselectivity. Whereas NaO-t
Stereoselective catalytic Tishchenko reduction of β-hydroxyketones using scandium triflate
Gillespie, Kevin M.,Munslow, Ian J.,Scott, Peter
, p. 9371 - 9374 (1999)
A number of aliphatic and aromatic β-hydroxyketones were reduced to 1,3-diol monoesters by aldehydes in the presence of a catalytic amount of scandium triflate. Chiral substrates were reduced with high 1,3-anti diastereoselectivity.
The zirconium alkoxide-catalyzed aldol-tishchenko reaction of ketone aldols
Schneider, Christoph,Hansch, Markus,Weide, Timo
, p. 3010 - 3021 (2005)
The aldol-Tishchenko reaction of ketone aldols as enol equivalents has been developed as an efficient strategy to furnish differentiated 1,3-anti-diol monoesters in one step. The thermodynamically unstable ketone aldols undergo a facile retro-aldolization to yield a presumed zirconium enolate in situ, which then undergoes the aldol-Tishchenko reaction in typically high yields and with complete 1,3-anti diastereocontrol. Evaluation of a broad range of metal alkoxides as catalysts and optimization of the reaction protocol led to a modified zirconium alkoxide catalyst with attenuated Lewis acidity and dichloromethane as solvent, which resulted in suppression of the undesired acyl migration to a large extent. Various ketone aldols have been prepared and subjected to the general process, giving rise to a broad range of differently substituted 1,3-anti-diol monoesters, which may be hydrolyzed to the corresponding 1,3-anti-diols.
In search of open-chain 1,3-stereocontrol
Barbero, Asun,Blakemore, David C.,Fleming, Ian,Wesley, Robert N.
, p. 1329 - 1352 (2007/10/03)
Methylation of methyl 4-phenylpentanoate 25 gives the diastereoisomers methyl (2RS,4SR)-2-methyl-4-phenylpentanoate 26 and methyl (2RS,4RS)- 2-methyl-4-phenylpentanoate 27 in a ratio of 44:56. The aldehydes 3-dimethyl(phenyl)silylbutanal 28, 3-dimethyl(ph
Stereocontrolled reductive amination of 3-hydroxy ketones
Haddad, Mansour,Dorbais, Jerome,Larcheveque, Marc
, p. 5981 - 5984 (2007/10/03)
syn-1,3-Aminoalcohols are synthesized in high diastereomeric excess by reductive amination of 3-hydroxyketones with sodium cyanoborohydride in the presence of benzylamine.
Chiral Organometallic Reagents, I. Stereoselective Exchange of Diastereotopic Bromine Atoms by Lithium in 1,1-Dibromo-3-(trimethylsilyloxy)alkanes
Hoffmann, Reinhard W.,Bewersdorf, Martin,Krueger, Michael,Mikolaiski, Wolfgang,Stuermer, Rainer
, p. 1243 - 1252 (2007/10/02)
Bromine-lithium exchange in 1,1-dibromo-3-(trimethylsilyloxy)alkanes 4 and 6 affords the carbenoids 8 and 14, which have been added to ketones, aldehydes, arylboronates, and silylating agents.Diastereoselectivity in the generation and trapping of the carb
STUDIES ON THE DIASTEREOSELECTIVE REDUCTION OF β-HYDROXY KETONES TO 1,3-DIOLS WITH COMMON HYDRIDE REAGENTS
Bonini, Carlo,Bianco, Armandodoriano,Fabio,Romano Di,Mecozzi, Sandro,Proposito, Alessandro,Righi, Giuliana
, p. 75 - 80 (2007/10/02)
Some common reducing agents were employed in the diastereoselective reduction of several β-hydroxy ketones to their corresponding syn-1,3-diols.The use of NaBH4 with a Ti(IV) chelating species produced syn diols with a moderate to good selectivity significantly depending upon the reaction conditions chosen (solvent, temperature, nature of the titanium species).The use of LiAlH4 at low temperature, in the presence of LiI, showed a high selectivity for reduction to syn diols, thus demonstrating a possible chelating role of lithium.Some interesting preliminary results have been also obtained in the diastereoselective reduction of MEM-protected β-alkoxy ketones.
1,3-SYN DIASTEREOSELECTIVE REDUCTION OF β-HYDROXYKETONES WITH DIISOBUTYLALUMINUM HYDRIDE AND TRIBUTYLTIN HYDRIDE
Kiyooka, Syun-ichi,Kuroda, Hisanori,Shimasaki, Yayoi
, p. 3009 - 3012 (2007/10/02)
1,3-Syn diastereofacial selectivity (12 : 1) has been achieved in a facile reduction of β-hydroxyketones with DIBAL-H.Tributyltin hydride also has shown 1,3-syn selectivity.