| CPC C07D 267/16 (2013.01) [C07C 311/13 (2013.01); C07D 317/30 (2013.01); C07D 319/06 (2013.01); C07D 413/12 (2013.01); C07D 513/04 (2013.01)] | 4 Claims |
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1. A method comprising preparing a compound of formula 13-D or a salt thereof
![]() by reacting a compound of formula 13-C:
![]() with a corresponding compound of formula 6-L
![]() or a salt thereof, to provide the compound of formula 13-D or the salt thereof, wherein RP is selected from —C(═O)—C1-6alkyl, —C(═O)-phenyl, —C(═O)—O—C1-6alkyl, —C(═O)—O—C1-6alkyl-phenyl, and —C(═O)—O—phenyl;
wherein R2 is H, R3 is methyl, Ry is H, and R6 is Cl, and
wherein Rn is independently C1-6alkyl, or the two Rn moieties collectively form a C2-4alkyl bridge, wherein said bridge is optionally substituted by one to four C1-3alkyl and phenyl.
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