Process for the preparation of substituted benzofuran...

Details Process for the preparation of substituted benzofuran... Process for the preparation of substituted benzofuran...

C - Chemistry, Metallurgy

07

D

C07D 405/12 (2006.01) C07D 307/79 (2006.01) C07D 307/83 (2006.01) C07D 307/84 (2006.01) C07D 451/00 (2006.01) C07D 451/04 (2006.01) C07D 453/00 (2006.01) C07D 453/02 (2006.01) C07D 453/06 (2006.01) C07D 455/02 (2006.01) C07D 471/08 (2006.01) C07D 487/04 (2006.01)

Patent

CA 2099107

2099107 9212147 PCTABS00014 Substituted benzofuran derivatives of formula (I), wherein one of R1 and R2 is hydrogen or halogen and the other is, independently, an amino group or a C2-C4 alkanoyl amino group; R3 is hydrogen; a linear or branched C1-C4 alkyl, C1-C4 alkoxy or C2-C4 alkoxycarbonyl group; halogen; or phenyl unsubstituted or substituted by a C1-C4 alkyl group; A is a group -(CH2)n-Het wherein Het is an optionally substituted heteromonocyclic or heterobicyclic ring containing one or two nitrogen atoms, and n is zero or an integer of 1 to 3; and the symbol ..... represents a single or double bond; may be prepared by a process comprising reacting a compound of formula (II), in which L is a leaving group and R4 is hydrogen or a carboxy protecting group, with a compound of the formula (III): R'3-C=C-R'3 to obtain a compound of formula (IV) which is then cyclized to obtain a compound of formula (V) which is reacted with a compound of the formula (VI): H2N-A.

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