| 摘要 |
The present invention is a process comprising contacting a compound of formula 6: or a pharmaceutically acceptable salt thereof; with a deprotecting reagent to form a compound of formula A: or a pharmaceutically acceptable salt thereof; where R is H or OR1; R1 and each R1′ are protecting groups; R1″ is H or OH, and n is 0, 1, 2, 3, 4 , or 5. |
