Patent ID: 8741513

Claim:
A method for preparing an alizarin derivative compound comprising: (A) preparing a compound represented by the following Formula (2) by protecting a cathecol moiety included in a compound represented by the following Formula (3) with a protecting group containing P; and (B) preparing an alizarin derivative compound represented by the following Formula (1) via alkylation of a 4-position of, and deprotection of the protecting group containing P at the cathecol moiety of the compound represented by Formula (2) prepared by the step (A); wherein, in Formula (1), R 1 represents a hydrogen atom or a substituent; n represents an integer of 1 to 3, when n is 1, L represents —C(R a1 )(R a2 )(R a3 ); R a1 , R a2 , and R a3 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; at least one of R a1 , R a2 , and R a3 represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; when n is 2, L represents a substituted or unsubstituted divalent linkage group having 2 to 20 carbon atoms; when n is 3, L represents a substituted or unsubstituted trivalent linkage group having 2 to 30 carbon atoms; and Q represents an atomic group which is needed to form an aromatic ring or a heteroaromatic ring with adjacent carbon atoms; wherein, in Formula (2), P represents an atomic group which includes an atom(s) selected from a hydrogen atom, a carbon atom, an oxygen atom, a sulfur atom, a silicon atom and a boron atom, and which is needed to form a ring structure with two adjacent oxygen atoms and two carbon atoms; and each of R 1 and Q has the same definition as R 1 and Q in Formula (1) respectively; and wherein, in Formula (3), each of R 1 and Q has the same definition as R 1 and Q in Formula (1) respectively.