| abstract |
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 OR 1 ; R 1 and each R 1' are protecting groups; R 1 n " is H or OH, and n is 0, 1, 2, 3, 4, or 5. |