Scalable synthesis of reduced toxicity derivative of amphotericin B
Disclosed is a simplified, readily scalable series of individual methods that collectively constitute a method for the synthesis of C2′epiAmB, an efficacious and reduced-toxicity derivative of amphotericin B (AmB), beginning from AmB. Also provided are various compounds corresponding to intermediates in accordance with the series of methods.
1. A compound, represented by
wherein, independently for each occurrence,
R 1 is C(O)OR a ;
R 2 is selected from the group consisting of 2-alken-1-yl, benzyl, and (R b ) 3 Si—;
R 3 is substituted or unsubstituted aryl, or C 1 -C 6 alkyl;
R 5 is (R b ) 3 Si—;
R 6 is —C(O)R c ;
R a is selected from the group consisting of 2-alken-1-yl, tert-butyl, and benzyl;
R b is substituted or unsubstituted aryl, or C 1 -C 6 alkyl; and
R c is substituted or unsubstituted aryl.
2. The compound of claim 1 , wherein R a is 2-alken-1-yl; R 2 is 2-alken-1-yl; R 3 is substituted or unsubstituted aryl; R c is substituted or unsubstituted phenyl; and R b is C 1 -C 6 alkyl.
3. The compound of claim 1 , represented by
4. A compound, represented by
wherein, independently for each occurrence,
R 1 is C(O)OR a ;
R 2 is selected from the group consisting of 2-alken-1-yl, benzyl, and (R b ) 3 Si—;
R 3 is substituted or unsubstituted aryl, or C 1 -C 6 alkyl;
R 5 is (R b ) 3 Si—;
R a is selected from the group consisting of 2-alken-1-yl, tert-butyl, and benzyl; and
R b is substituted or unsubstituted aryl, or C 1 -C 6 alkyl.
5. The compound of claim 4 , wherein R a is 2-alken-1-yl; R 2 is 2-alken-1-yl; R 3 is substituted or unsubstituted aryl; and R b is C 1 -C 6 alkyl.
6. The compound of claim 4 , represented by
7. A compound, represented by
wherein, independently for each occurrence,
R 1 is C(O)OR a ;
R 2 is selected from the group consisting of 2-alken-1-yl, benzyl, and (R b ) 3 Si—;
R 3 is substituted or unsubstituted aryl, or C 1 -C 6 alkyl;
R a is selected from the group consisting of 2-alken-1-yl, tert-butyl, and benzyl; and
R b is substituted or unsubstituted aryl, or C 1 -C 6 alkyl.
8. The compound of claim 7 , wherein R a is 2-alken-1-yl; R 2 is 2-alken-1-yl; and R 3 is substituted or unsubstituted aryl.
9. The compound of claim 7 , represented by
10. A compound, represented by
wherein, independently for each occurrence,
R 3 is substituted or unsubstituted aryl, or C 1 -C 6 alkyl.
11. The compound of claim 10 , wherein R 3 is substituted or unsubstituted aryl.
12. The compound of claim 10 , represented by
13. A method of making 2′ epiAmB
comprising the step of:
wherein, independently for each occurrence,
R 1 is C(O)OR a ;
R 2 is selected from the group consisting of 2-alken-1-yl, benzyl, and (R b ) 3 Si—;
R 3 is substituted or unsubstituted aryl, or C 1 -C 6 alkyl;
R 5 is (R b ) 3 Si—;
R 6 is —C(O)R c ;
R a is selected from the group consisting of 2-alken-1-yl, tert-butyl, and benzyl;
R b is substituted or unsubstituted aryl, or C 1 -C 6 alkyl;
R c is substituted or unsubstituted aryl;
R d is C 1 -C 6 alkyl or aryl; and
solvent 7 is a nonpolar aprotic solvent.