Ortho-substituted phenyl amidine and phenyl guanidine derivatives and antidiabetic or hypoglycaemic agents containing them
申请人:The Boots Company PLC
公开号:EP0385038A1
公开(公告)日:1990-09-05
Compounds of formula I
and their salts in which n = 0 or 1, R1 and R2 are each aliphatic or cycloalkyl or NR1 R2 is an optionally substituted heterocyclic ring, R3 is alkyl, cycloalkyl or optionally substituted amino, R5 is an aliphatic group, R6 is H, an optionally substituted aliphatic group or a cycloalkyl group, or R3 and R5 together with the nitrogen and carbon atoms to which they are attached form an optionally substituted heterocyclic ring or R5 and R6 together with the nitrogen to which they are attached form a heterocyclic ring optionally substituted by alkyl and R7 is optionally substituted alkyl, alkoxy, alkylthio, alkylsulphinyl, alkylsulphonyl, alkoxycarbonyl, trifluoromethyl or cyano have utility as hypoglycaemic agents.
Synthesis of Spirooxindoles via the <i>tert</i>-Amino Effect
作者:Kinthada Ramakumar、Tapan Maji、James J. Partridge、Jon A. Tunge
DOI:10.1021/acs.orglett.7b01752
日期:2017.8.4
A new method is developed for the synthesis of spirooxindoles from amines and isatins via C–H functionalization. The reaction leverages the tert-amino effect to form an enolate–iminium intermediate via [1,5]-hydride shift followed by cyclization. Interestingly the hydride migrates to the N atom of a C═N, which is atypical for hydride additions to imines.