Metal-free C(sp<sup>3</sup>)–H bond sulfonyloxylation of 2-alkylpyridines and alkylnitrones
作者:Chang-Sheng Wang、Pierre H. Dixneuf、Jean-François Soulé
DOI:10.1039/c8ob01075g
日期:——
Pyridin-2-ylmethyl tosylate derivatives are obtained in high yields from 2-alkylpyridine 1-oxides via a [3,3]-sigmatropicrearrangement of the adduct between 2-alkylpridine 1-oxides with benzenesulfonyl chlorides. Moreover, alkylnitrones also undergo [3,3]-sigmatropicrearrangement to give α-tosylated ketones after hydrolysis. Substitution reactions with nucleophiles then lead to diverse useful functionalizations
The condensation of (chloromethyl)heterarenes with aromatic aldehydes was investigated, resulting in a simple and flexible general procedure for the synthesis of 2-aryl-1-chloro-1-heteroarylalkenes. The best reaction conditions were found to be heating in N,N-dimethylformamide in the presence of chlorotrimethylsilane as a promoter and water-scavenger.
STEREOSPECIFIC PROCESS FOR THE SYNTHESIS OF 2-YL CHROMAN DERIVATIVES
申请人:Wyeth
公开号:EP1432694A1
公开(公告)日:2004-06-30
[EN] STEREOSPECIFIC PROCESS FOR THE SYNTHESIS OF 2-YL CHROMAN DERIVATIVES<br/>[FR] PROCEDE STEREOSPECIFIQUE DE SYNTHESE DE DERIVES DE 2-YLE CHROMANE
申请人:WYETH CORP
公开号:WO2003031428A1
公开(公告)日:2003-04-17
This invention provides a process for the stereospecific preparation of 2-yl-chroman and-chromene derivatives of the formula (I). These compounds are useful for the preparation of optically active 2-aminomethyl- and 2-azaheterocyclylmethyl-chromans.