| abstract |
A method for manufacturing a compound represented by the following formula (I): n n n n n n n n n n wherein R 1 represents a C 1 -C 19 alkyl, R 2 represents a C 1 -C 4 alkyl, and Ac represents an acetyl, wherein the compound of the formula (I) is optionally contained with up to 10 wt. % of a compound represented by the following formula (II): n n n n n n n n n n or a pharmacologically acceptable salt thereof, involving reacting a compound represented by the following formula (13): n n n n n n n n n n wherein R 2 represents a C 1 -C 4 alkyl and Ac represents an acetyl, with a compound represented by the formula R 1 C(OR 7 ) 3 , wherein R 1 represents a C 1 -C 19 alkyl and R 7 represents a C 1 -C 6 alkyl, or a pharmacologically acceptable salt thereof. |