作者:Alexander S. Dudnik、Todd Schwier、Vladimir Gevorgyan
DOI:10.1021/ol800229h
日期:2008.4.1
propargylic esters leading to unsymmetricallysubstituted naphthalenes has been developed. This cascade reaction involves an unprecedented tandem sequence of 1,3- and 1,2-migration of two different migrating groups. It is believed that this transformation likely proceeds via the formation of 1,3-diene intermediate or its precursor, which upon cyclization and aromatization steps transforms into the naphthalene
A new, practical route to enoxysilanes is described from simple enolizable aldehydes or ketones, using the trimethylchlorosilane-sodium iodide—tertiary amine reagent in acetonitrile. From certain aldehydes, an onium intermediate has been isolated. A conformational study of this onium intermediate and a thermal unimolecular syn-elimination process may explain the stereoselectivity of the reaction. Such
New Method for the Synthesis of 2‐Aza‐1,3‐Butadienes
作者:Attila Sisak
DOI:10.1080/00397910600946033
日期:2006.12
Abstract 2‐Aza‐1,3‐butadienes have been synthesized from carbonyl compounds and 1,1,1,3,3,3‐hexamethyl‐disilazane in the presence of cobalt‐containing catalysts. The best yields (up to 95%) were achieved in the case of aldehydes branched in the α-position and 2-methylcyclohexanone. In the case of two α,β‐unsaturated ketones, pyridine derivatives were found as the main products.
Photocatalytic Synthesis of Acetals and Ketals from Aldehydes and Silylenolethers without the Use of Acids
作者:Desirée Steuernagel、Hans‐Achim Wagenknecht
DOI:10.1002/chem.202203767
日期:2023.3
Use light instead of acids: Silylenolethers derived from aldehydes and ketones as well as aldehydes themselves react efficiently to give acetals in good to excellent yields. The substrate range with respect to both aldehydes and alcohols is broad, and acid- and hydrogen-labile protecting groups are tolerated.