CPC A61K 31/7084 (2013.01) [A61K 31/7076 (2013.01); A61K 47/6807 (2017.08); A61P 35/00 (2018.01); C07H 21/00 (2013.01); C07H 21/02 (2013.01)] | 20 Claims |
1. A method of preparing a compound having Formula (IA):
![]() or a pharmaceutically acceptable salt thereof, the method comprising deprotecting a compound having Formula (7):
![]() wherein:
X1 and X2 are each independently an oxygen atom or a sulfur atom;
R1 and R2 are each independently a hydroxy group, a protected hydroxy group, or a halogen atom;
B1 is:
![]() R18 is hydrogen or C1-6 alkyl;
R19 is a halogen atom;
B2 is:
![]() wherein the —NH2 group is optionally protected, or
![]() wherein the —NH2 group is optionally protected; and
Q1, Q2, Q3 and Q4 are each independently an oxygen atom or a sulfur atom,
wherein the compound having Formula (IA), or a pharmaceutically acceptable salt thereof, is selected from the group consisting of:
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