Samarium Ion-Promoted Cross-Aldol Reactions and Tandem Aldol/Evans−Tishchenko Reactions
作者:Ling Lu、Hung-Yu Chang、Jim-Min Fang
DOI:10.1021/jo981675b
日期:1999.2.1
effective Lewis acids to catalyze tandem aldol/Evans-Tishchenko reactions. The aldol/Evans-Tishchenko reactions of methyl ketones with aldehydes occurred at 0 degrees C to give alpha,gamma-anti diol monoesters 53a-59a. When the reactions were conducted at room temperature, a certain degree of transesterification took place. The aldol/Evans-Tishchenko reactions of ethyl or benzyl ketones with aldehydes
Reactions of monosaccharide derivatives with diazocarbonyl compounds. Reactivity and synthetic applications
作者:Francisco Sarabia García、Gracia María Pedraza Cebrián、Alfonso Heras López、F.Jorge López Herrera
DOI:10.1016/s0040-4020(98)00369-x
日期:1998.6
different stabilized diazocompounds is reported. Studies on the reactivity of the condensation products have been undertaken, finding out novel transfromations of β-oxy-α-diazo carbonyl compounds with sinthetic applications. Thus, a stereoselective Wolff rearrangement provided syn 2-hydroxy-1-methyl compounds, which represent macrolide type structural subunits. On the other hand, rhodium (II) mediated rearrangements
Role of Pseudoephedrine as Chiral Auxiliary in the “Acetate-Type” Aldol Reaction with Chiral Aldehydes; Asymmetric Synthesis of Highly Functionalized Chiral Building Blocks
作者:Marta Ocejo、Luisa Carrillo、Jose L. Vicario、Dolores Badía、Efraim Reyes
DOI:10.1021/jo101878j
日期:2011.1.21
have studied in depth the aldol reaction between acetamide enolates and chiral α-heterosubstituted aldehydes using pseudoephedrine as chiralauxiliary under double stereodifferentiation conditions, showing that high diastereoselectivities can only be achieved under the matched combination of reagents and provided that the α-heteroatom-containing substituent of the chiral aldehyde is conveniently protected
β-Oxy-α-diazo carbonyl compounds. I. Photochemistry of chiral β-oxy-α-diazo methyl ketones. Stereoselective synthesis of chiral macrolide synthons.
作者:Fidel J. López-Herrera、Francisco Sarabia-García
DOI:10.1016/s0040-4039(00)79185-4
日期:1993.5
In this work we studied the reaction of 2,3-O-isopropylidene-D-glyceraldehyde 1 with diazoacetone 2, the photochemical behaviour of the condensation product, and analysed the protector group effect that modifies the photochemically induced intramolecular processes of the condensation product and its derivatives. We report the successful stereoselective synthesis of 3-hydroxy-2-methyl carboxilate derivatives
Proline-catalyzed aldol reaction of acetone with (R)- and (S)-2,3-O-alkylideneglyceraldehydes
作者:Yu. Yu. Kozhemyakin、Yu. Yu. Kozyrkov
DOI:10.1134/s107042801504017x
日期:2015.4
The results of proline-catalyzed aldol reaction of acetone with O,O'-alkylidene derivatives of glyceraldehyde are determined by the configuration of the chiral center in the aldehyde. The reaction of (S)-2,3-O-alkylideneglyceraldehyde with acetone in the presence of L-proline was characterized by higher diastereoselectivity.