An improved process for preparing 3-(4-aminoethoxy-benzoyl)benzo beta -thiophenes
申请人:ELI LILLY AND COMPANY
公开号:EP0693488A1
公开(公告)日:1996-01-24
The invention provides a process for preparing 6-alkoxy-3-(4-alkoxyphenyl)benzo[B]thiophenes in good yield on a manufacturing scale without generating a thick, potentially yield-reducing, paste. The invention also provides methods for converting a-(-alkoxyphenylthio)-4-alkoxyacetophenones into 6-hydroxy-2-(4-hydroxyphenyl)-3-[4-(2-aminoethoxy)-benzoyl]benzo[B]thiophenes via acylation of a dialkoxy benzo[B]thiophene. Each of these preparations relies on an intramolecular cyclization of a dialkoxy acetophenone derivative to yield a benzo[B]thiophene without generating a thick paste that lowers overall yields on a manufacturing scale.
Carbaminsäureester, Schädlingsbekämpfungsmittel, die diese Ester als Wirkstoffe enthalten, Verfahren zur Herstellung dieser Ester sowie deren Verwendung zur Bekämpfung von Schädlingen