79606-79-4Relevant articles and documents
A combined DFT and NMR investigation of the zinc organometallic intermediate proposed in the syn-selective tandem chain extension-aldol reaction of β-keto esters
Aiken, Karelle S.,Eger, Wilhelm A.,Williams, Craig M.,Spencer, Carley M.,Zercher, Charles K.
experimental part, p. 5942 - 5955 (2012/10/08)
The tandem chain extension-aldol (TCA) reaction of β-keto esters provides an α-substituted γ-keto ester with an average syn:anti selectivity of 10:1. It is proposed that the reaction proceeds via a carbon-zinc bound organometallic intermediate potentially bearing mechanistic similarity to the Reformatsky reaction. Evidence, derived from control Reformatsky reactions and a study of the structure of the TCA intermediate utilizing DFT methods and NMR spectroscopy, suggests the γ-keto group of the TCA intermediate plays a significant role in diastereoselectivity observed in this reaction. Such coordination effects have design implications for future zinc mediated reactions.
Microwave-assisted Paal-Knorr reaction - Three-step regiocontrolled synthesis of polysubstituted furans, pyrroles and thiophenes
Minetto, Giacomo,Raveglia, Luca F.,Sega, Alessandro,Taddei, Maurizio
, p. 5277 - 5288 (2007/10/03)
An efficient and highly versatile synthesis of furans, pyrroles and thiophenes is described. Starting from commercially available or easily prepared β-keto esters, functional homologation provides differently substituted 1,4-diketones that can be transfor
Tandem chain extension-aldol reaction: syn selectivity with a zinc enolate.
Lai,Zercher,Jasinski,Reid,Staples
, p. 4169 - 4171 (2007/10/03)
A tandem chain extension-aldol reaction was developed in which beta-keto esters are transformed to alpha-substituted-gamma-keto esters in an efficient zinc-mediated, one-pot reaction. The diastereoselectivity of the reaction ranged from good to excellent