Synthesis of 1,3-Di[alkoxy(aryloxy)carbonyl]-2-oxo-2,3-dihydroindoles
摘要:
Two protocols have been developed for the synthesis of 1,3-di[alkoxy(aryloxy)carbonyl]-2-oxo-2,3-dihydroindoles starting from the corresponding N,O-diacyl derivatives obtained by treatment of 2-oxindoles with chloroformic acid esters and, triethylamine. The first is rearrangement of N,O-diacylated compounds in the presence of 4-dimethylaminopyridine to give N,C(3)-diacylated products with identical acyl groups in the two positions. The second involves O-deacylation of the N,O-diacylated compounds, followed by O-acylation and rearrangement resulting N,C(3)-diacylated 2-oxindoles with different acyl groups in the two positions. (C) 2000 Elsevier Science Ltd. All rights reserved.
A new, practical synthesis of the antirheumatic oxindole derivative, tenidap, has been elaborated. The new approach has initiated studies on the mechanism of the acylation reactions of oxindoles. Methods have been developed for the synthesis of 1-[alkoxy(or aryloxy)carbonyl]- and 1,3-di[alkoxy(or aryloxy)carbonyl]oxindoles starting from oxindoles. The route designed for tenidap has provided a facile
Enantioselective C2‐Alkylation of Indoles through a Redox‐Relay Heck Reaction of 2‐Indole Triflates
作者:Nicholas J. Race、Qianjia Yuan、Matthew S. Sigman
DOI:10.1002/chem.201805416
日期:——
enantioselective redox‐relay Heck reaction of 2‐indole triflates and disubstituted alkenes is reported. This process combines readily available indole triflates with a variety of alkenes to afford a range of indole derivatives bearing a stereocenter adjacent to C2. Enantioselectivity is achieved through use of a simple pyridine‐oxazoline ligand. Tuning the electronics of the indole, through judicious choice of N‐protecting
The development of a new, practicalsynthesis to tenidap is described. N,O-Dialkoxy(aryloxy)carbonylation of 5-chloro-2-oxo-2,3-dihydroindole, followed by removal of the O-alkoxy(aryloxy)carbonyl group gave 1-[alkoxy(aryloxy)carbonyl]-5-chloro-2-oxo-2,3-dihydroindoles in good yields. The latter compounds were thenoylated in the 3-position. The role of DMAP in the acylation reaction is discussed. The
[EN] PROCESS FOR THE PREPARATION OF TENIDAP<br/>[FR] PROCEDE DE PREPARATION DE TENIDAP
申请人:EGIS GYÓGYSZERGYÁR RT.
公开号:WO1997036895A1
公开(公告)日:1997-10-09
(EN) The invention relates to new processes for the preparation of 5-chloro-3-(2-thenoyl)-1-carboxamido-2-oxindole (tenidap) of Formula (I) and salts thereof which are known analgesic and spasmolytic therapeutical active substances.(FR) Nouveaux procédés de préparation de 5-chloro-3-(2-thénoyl)-1-carboxamido-2-oxindole (tenidap) répondant à la formule (I), et ses sels, connus comme étant des substances à activité thérapeutique analgésique et spasmolytique.