119-25-5Relevant articles and documents
METHOD FOR THE PREPARATION OF TRICYCLIC AMINO ALCOHOL DERIVATIVES THROUGH AZIDES
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Page 41, (2008/06/13)
The present invention is directed to processes for the preparation of a tricyclic amino-alcohol derivative useful for treating and preventing diabetes, obesity, hyperlipidemia and the like, which compound is represented by the formula (1): wherein R1 represents a lower alkyl group or a benzyl group; *1 represents an asymmetric carbon atom; R2 represents a hydrogen atom, a halogen atom or a hydroxyl group; and A represents one of the following groups: wherein X represents NH, O or S; R5 represents a hydrogen atom, a hydroxyl group, an amino group or an acetylamino group; and *2 represents an asymmetric carbon atom when R5 is not a hydrogen atom. The processes of the present invention proceed via azide derivatives and are convenient, practical preparing processes with low cost which comprise a small number of steps with good industrial work efficiency.
Synthesis of Substituted Indoles via Meerwein Arylation
Raucher, Stanley,Koolpe, Gary A.
, p. 2066 - 2069 (2007/10/02)
A new method for the synthesis of substituted indoles is detailed.Meerwein arylation of 4- and 6-substituted 2-nitrobenzenediazonium chlorides with vinyl acetate or vinyl bromide and subsequent reductive cyclization of the resulting adducts affords the corresponding 6- and 4-substituted (CH3, OCH3, Cl, Br, CF3) indoles.The diazonium bisulfates of weakly basic 2-nitroanilines (4-Cl, 6-Br, 4-CF3) gave higher yields of Meerwein arylation adducts than the corresponding diazonium chlorides.Coupling of 2-nitrobenzenediazonium chloride with 2-acetoxy-1-alkenes followed byreductive cyclization affords 2-alkylindoles.