Oxidative rearrangement of alkenes using in situ generated hypervalent iodine(III)
作者:Anees Ahmad、Paulo Scarassati、Nazli Jalalian、Berit Olofsson、Luiz F. Silva
DOI:10.1016/j.tetlet.2013.08.012
日期:2013.10
A novel protocol for the oxidativerearrangement of alkenes using in situ generated hypervalent iodine(III) was developed. This approach uses inexpensive, readily available, and stable chemicals (PhI, mCPBA, and TsOH) giving rearrangement products in yields comparable to those obtained using the more expensive commercially available [hydroxy(tosyloxy)iodo]benzene [HTIB or Koser’s reagent]. Additionally
Synthesis of Chromanes and 4H-Chromenes: Exploring the Oxidation of 2H-Chromenes and Dihydro-1-benzoxepines by Hypervalent Iodine(III)
作者:Luiz Silva、Anees Ahmad
DOI:10.1055/s-0032-1317497
日期:——
The reaction of various oxygen-containing benzo-fused cycloalkenes were studied with the hypervalent iodine reagent hydroxy(tosyloxy) iodo]benzene [PhI(OH)OTs, HTIB]. 2H-Chromene and 4-methyl-2H-chromene resulted in substituted 4H-chromene and cis-3,4-dialkoxy-4-methyl-3,4-dihydro-2H-chromenes, respectively. Ring contraction to chromanes and benzofurans was observed for dihydrobenzoxepines and 2,2-dimethyl-2H-chromenes, respectively.
BENZOPYRANS AND BENZOXEPINES, PHARMACEUTICAL COMPOSITIONS COMPRISING THEM AND PREPARATION PROCESS