A method for producing a 6&agr;-fluorinated corticosteroid or derivative thereof by reacting a 17-hydroxy-21-ester epoxide of Formula II
1
with a stereoselective fluorinating agent to stereoselectively form a 21-ester-17-hydroxy 6&agr;-fluorinated compound of Formula VII
2
R
1
can be OC(O)—R
d
; R
4
can be C(O)—R
d
; R
3
can be H or R
d
. Each R
d
may be the same or different and is independently selected from (C
1-4
)alkyl, aryl and heteroaryl. The dashed line can be a single or a double bond. R
4
may be, for example, acetyl; R
3
may be, for example, alpha or beta methyl; R
4
may be, for example, acetate or propionate. The stereoselective fluorinating agent used in the reaction may be, for example, a fluoropyridinium or fluoroquinuclidium compound, for example, Selectfluor®.
通过将式II1的17-羟基-21-酯环氧化合物与具有立体选择性的
氟化剂反应,以立体选择性形成式VII2的21-酯-17-羟基6α-
氟化合物的方法,其中R1可以是OC(O)—Rd;R4可以是C(O)—Rd;R3可以是H或Rd。每个Rd可以相同也可以不同,并且从(C1-4)烷基、芳基和杂环芳基中独立选择。虚线可以是单键或双键。例如,R4可以是乙酰基;例如,R3可以是α或β甲基;例如,R4可以是
乙酸酯或
丙酸酯。反应中使用的具有立体选择性的
氟化剂可以是
氟吡啶或
氟喹啉化合物,例如Selectfluor®。