Patent ID: 7420070

Claim:
A process for preparing a compound represented by the formula: wherein R 1 and R 2 are each a hydrogen atom or an optionally substituted hydrocarbon group, R 3 is an optionally substituted aromatic group, ring A is an optionally substituted benzene ring, R 8 and R 9 are each a hydrogen atom, ring C is a benzene ring optionally having substituent besides the amino group, or a salt thereof, comprising optically resolving a 2,3-dihydrobenzofuran compound represented by the formula: wherein the symbols are as defined above, or a salt thereof with an optically active acidic compound to give the compound represented by the formula: wherein the symbols are as defined above, or a salt thereof, and reacting the obtained compound (I″) with a compound represented by the formula: wherein L 1 and L 2 are each a chlorine atom hydroxy and the ring A, R 8 , and R 9 are as defined above, or a salt thereof, optionally in the presence of a base.