A Concise Route to 2-Amino-3-aryl-3<i>H</i>-benzofurans and their Use as Precursors to 3-Aryl-3<i>H</i>-benzofuran-2-one and 1<i>H</i>-Benzofuro[2,3-<i>b</i>]pyridin-2-one Derivatives
作者:Michèle Gerster、Reto Wicki
DOI:10.1055/s-2003-44389
日期:——
A concise approach to 2-amino-3-aryl-3H-benzofurans based on the Michael addition of NaCN onto in situ generated substituted o-quinone methides has been developed. Straightforward access to 3-aryl-3H-benzofuran-2-ones was achieved upon acidic hydrolysis whereas N-Boc-protected 2-amino-3-aryl-3H-benzofurans underwent smooth intramolecular cyclisation to give 1H-benzofuro[2,3-b]pyridin-2-one derivatives.
Process for the preparation of 3-arly-benzofuranones
申请人:——
公开号:US20030018191A1
公开(公告)日:2003-01-23
Process for the preparation of compounds of formula I
1
wherein the general symbols are as defined in claim
1,
which process comprises reacting a compound of formula V
2
wherein the general symbols are as defined in claim
1,
with carbon monoxide in the presence of a catalyst.
Polyester and polyamide compositions of low residual aldehyde content
申请人:Tinkl Michael
公开号:US20050176859A1
公开(公告)日:2005-08-11
A mixture of a polyester or a polyamide, such as poly(ethylene terephthalate) PET, and a suitable stabilizer selected from the group consisting of certain Mannich base compounds, when extrusion compounded exhibits a lower residual acetaldehyde content than does PET or polyamide alone when similarly treated. The invention pertains to any polyester or polyamide used in the manufacture of molded articles, fibers, or films, for instance bottles or containers which are used to store consumer materials, for example food, beverages and water.