Preparation and properties of chiral 4-pyrrolidinopyridine (PPY) analogues with dual functional side chains
摘要:
Chiral 4-pyrrolidinopyridine analogues 8-13 with two distinct functional side chains at C(2) and C(4) of the pyrrolidine ring were prepared from 4-hydroxy-L-proline. We examined desymmetrization of meso-1,3-cyclohexanediol through enantioselective acylation using these catalysts and found that introduction of a C(4)-side chain was effective for improving both the chemo- and enantioselectivity of acylation. (C) 2003 Elsevier Science Ltd. All rights reserved.
Preparation and properties of chiral 4-pyrrolidinopyridine (PPY) analogues with dual functional side chains
摘要:
Chiral 4-pyrrolidinopyridine analogues 8-13 with two distinct functional side chains at C(2) and C(4) of the pyrrolidine ring were prepared from 4-hydroxy-L-proline. We examined desymmetrization of meso-1,3-cyclohexanediol through enantioselective acylation using these catalysts and found that introduction of a C(4)-side chain was effective for improving both the chemo- and enantioselectivity of acylation. (C) 2003 Elsevier Science Ltd. All rights reserved.
D-glucopyranoside with isobutyric anhydride in the presence of the catalysts gave the 6- O-acylate as the major product via acylation of a primary hydroxylgroup. On the other hand, the 4- O-acylate was obtained as the major product in 66% regioselectivity via acylation of the secondaryhydroxylgroup at C-4 on treatment of octyl β- D-glucopyranoside with isobutyric anhydride in the presence of a PPY catalyst. Use
Chiral 4-pyrrolidinopyridine analogues 8-13 with two distinct functional side chains at C(2) and C(4) of the pyrrolidine ring were prepared from 4-hydroxy-L-proline. We examined desymmetrization of meso-1,3-cyclohexanediol through enantioselective acylation using these catalysts and found that introduction of a C(4)-side chain was effective for improving both the chemo- and enantioselectivity of acylation. (C) 2003 Elsevier Science Ltd. All rights reserved.