Novel compound or salt thereof, catalyst, method of preparing novel compound or salt thereof and method of preparing mannich product

A compound represented by a formula (I) or a salt thereof

• wherein
• R1 and R2 are independently selected from the group consisting of an alkyl, an alkenyl, an alkynyl, a heteroalkyl, a heteroalkenyl, or a heteroalkynyl, which may be substituted with one or more selected from the group consisting of an aryl and a heteroaryl, or
• R1 and R2 together form —(CH2)p—, and the —(CH2)p— forms a ring in combination with the nitrogen atom that the R1 and the R2 are both attached to,
• wherein p is an integer from 2 to 8, and
• the —(CH2)p— may be interrupted by one to three hetero atom(s) and may be substituted with one or more selected from the group consisting of an alkyl, an aryl, and a heteroaryl;
• R3 is independently selected from the group consisting of an alkyl, and an aryl, or
• two adjacent R3s may form a ring with carbon atoms they are attached to;
• R4 is independently selected from the group consisting of a halogen atom, an alkyl, an alkoxy, a cyano, a nitro, and an acylamido, or
• two adjacent R4s may form a ring in combination with carbon atoms they are attached to;
• m is an integer from 0 to 8;
• and
• n is an integer from 0 to 5.