An efficient 1-pot procedure for the Zn-mediated redn. of nitro arenes in the presence of chloroformates leading to the corresponding N,O-bisprotected hydroxylamine is described. Reactions proceed smoothly under ambient conditions in THF-water mixts. in good to excellent yield (34-81%). Solvolysis of the bisprotected hydroxylamines with NaOMe at room temp. provides access to synthetically versatile
Rearrangement of Differentially Protected<i>N</i>-Arylhydroxylamines
作者:Achim Porzelle、Michael D. Woodrow、Nicholas C. O. Tomkinson
DOI:10.1002/ejoc.200800672
日期:2008.10
The rearrangement of a series of N,O-difunctionalized N-arylhydroxylamines to generate protected 2-aminophenols has been investigated. N-Boc-N-aryl-O-acylhydroxylamines are stable, isolable compds. which rearrange smoothly at temps. between 110 and 140°C. The corresponding N-Boc-N-aryl-O-sulfonylhydroxylamines were not isolated and rearrange to 1,2-difunctionalized aminophenols at room temp. in excellent