An efficient indium-mediated 2-bromoallylation of aldehydes at low temperature in aqueous DMF
摘要:
An efficient synthesis of 2-bromohomoallylic alcohols was carried out via an indium-mediated Barbier-type 2-bromoallylation of aldehydes in moderate yields. The reaction was performed at low temperature (-20 degrees C) in aqueous DMF in order to minimize decomposition of 2-bromoallylindium reagent to allene. (C) 2011 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of gem-dihalopiperidines via the halo-aza-Prins cyclization reaction: access to piperidin-4-ones and pyridines
作者:Surjya Kumar Bora、Subhamoy Biswas、Bipin Kumar Behera、Anil K. Saikia
DOI:10.1039/d4ob00338a
日期:——
An efficient methodology for the synthesis of 4,4-dihalopiperidine derivatives in excellent yields has been developed using N-(3-halobut-3-en-1-yl)-4-methylbenzenesulfonamide and an aldehyde catalyzed by In(OTf)3. The reaction involves an initial formation of a six-membered carbocation via the aza-Prins cyclizationreaction followed by a nucleophilic attack by a halide ion to give 4,4-dihalopiperidine