Asymmetric synthesis of 4-amino-2,3,4-trideoxyaldonic acids: novel gaba c-glycoconjugates
摘要:
Stereochemically defined 4-amino-2,3,4-trideoxyaldonic acids 4, representatives of a new progeny of C-glycosylated GABAs, have been synthesized from the readily available aldehydo precursors 1 in three steps and 60-75% overall yields. The key reaction is the SnCl4-assisted regio- and diastereoselective homologation of 1 with the nitrogen-containing five-membered ring siloxydiene TBSOP.
Stereochemically defined 4-amino-2,3,4-trideoxyaldonic acids 4, representatives of a new progeny of C-glycosylated GABAs, have been synthesized from the readily available aldehydo precursors 1 in three steps and 60-75% overall yields. The key reaction is the SnCl4-assisted regio- and diastereoselective homologation of 1 with the nitrogen-containing five-membered ring siloxydiene TBSOP.
Casiraghi, Giovanni; Ulgheri, Fausta; Spanu, Pietro, Journal of the Chemical Society. Perkin transactions I, 1993, # 23, p. 2991 - 2998