A rapid assembly of homochiral 2,3,4-trisubstituted pyrrolidines
摘要:
The intramolecular 1,3-dipolar cycloaddition of homochiral dihydroimidazolium ylides, generated in situ, is the key reaction in a sequence that rapidly affords optically active 2,3,4-trisubstituted pyrrolidines suitably functionalised for further elaboration. (C) 1997 Elsevier Science Ltd.
A rapid assembly of homochiral 2,3,4-trisubstituted pyrrolidines
摘要:
The intramolecular 1,3-dipolar cycloaddition of homochiral dihydroimidazolium ylides, generated in situ, is the key reaction in a sequence that rapidly affords optically active 2,3,4-trisubstituted pyrrolidines suitably functionalised for further elaboration. (C) 1997 Elsevier Science Ltd.
An enantioselective route to pyrrolidines: removal of the chiral template from homochiral pyrroloimidazoles
作者:Raymond C.F. Jones、Kevin J. Howard、John S. Snaith、Alexander J. Blake、Wang-Shei Li、Peter J. Steel
DOI:10.1016/j.tet.2011.08.099
日期:2011.11
Two-step reductive removal of the chiral template from optically active pyrroloimidazoles, available from 1,3-dipolar cycloaddition of homochiral 4,5-dihydroimidazolium ylides, gives optically active substituted pyrrolidines. Selective manipulation of the substituents affords, e.g., naturally occurring and other optically active proline derivatives, and optically active pyrrolizidines and indolizidines