HETERO-CONDENSED RING COMPOUND

摘要

A compound represented by the formula (I) or a salt thereof:
wherein a ring Z is a 5 to 6-membered heteroaromatic ring having one or two heteroatoms in the ring; X 1 is a hydrogen atom, a hydroxy group, a hydroxy C 1-6 alkyl group, -B(OH) 2 , a boronate ester group, a cyclic boronate ester group, a boranyl group, a cyclic boranyl group, -BF 3 M n1 , -Sn(R 12 )(R 13 )(R 14 ), a leaving group, a carboxy group, a formyl group, or -NR 16 R 17 ; and X 2 is a hydrogen atom or -CO 2 R 18 .