The first ring inversion of pyranoses induced by bulky silyl protections at the 2- and 3-positions
摘要:
The pyranose rings of the 2,3-bis-O-tert-butyldiphenylsilyl-alpha- and beta-D-glucopyranoses, and of the 2,3-bis-O-tert-butyldimethylsilyl-beta-D-glucopyranose were in the C-1(4) form. These findings indicate that the introduction of bulky silyl protecting groups at the 2- and 3-positions can flip a pyranose ring into the axial-rich chair form. Previous such ring inversions have been carried out by the silyl protections at the 3- and 4-positions. (C) 2004 Elsevier Ltd. All rights reserved.
The first ring inversion of pyranoses induced by bulky silyl protections at the 2- and 3-positions
摘要:
The pyranose rings of the 2,3-bis-O-tert-butyldiphenylsilyl-alpha- and beta-D-glucopyranoses, and of the 2,3-bis-O-tert-butyldimethylsilyl-beta-D-glucopyranose were in the C-1(4) form. These findings indicate that the introduction of bulky silyl protecting groups at the 2- and 3-positions can flip a pyranose ring into the axial-rich chair form. Previous such ring inversions have been carried out by the silyl protections at the 3- and 4-positions. (C) 2004 Elsevier Ltd. All rights reserved.