Provided is a compound represented by formula (1a) or a pharmacologically acceptable salt thereof. However, R
1
to R
6
in the formula each independently represent an alkyl group or the like.
Chemical generation of o-quinone monoimines for the rapid construction of 1,4-benzoxazine derivatives
作者:Naganjaneyulu Bodipati、Rama Krishna Peddinti
DOI:10.1039/c2ob06681e
日期:——
successfully trapped with electron-rich olefins that led to the synthesis of hitherto unknown 1,4-benzoxazine derivatives. This unprecedented transformation was achieved by the oxidation of o-aminophenols bearing appropriate functionality on the arene residue with less expensive hypervalentiodine reagent in the presence of vinylic ethers or thioethers.