Efficient asymmetric synthesis of a functionalized Δ2-pyrazoline
摘要:
The first asymmetric synthesis of the (4S,SR)-5-carbomethoxy-4-hydroxy-Delta (2)-pyrazoline in four steps is described starting from the methyl 4,4-dimethoxy-3-oxobutanoate by sequential catalytic hydrogenation and electrophilic amination. (C) 2000 Elsevier Science Ltd. All rights reserved.
Efficient asymmetric synthesis of a functionalized Δ2-pyrazoline
摘要:
The first asymmetric synthesis of the (4S,SR)-5-carbomethoxy-4-hydroxy-Delta (2)-pyrazoline in four steps is described starting from the methyl 4,4-dimethoxy-3-oxobutanoate by sequential catalytic hydrogenation and electrophilic amination. (C) 2000 Elsevier Science Ltd. All rights reserved.
The diastereoselective syntheses of the O-protected ribosyl-beta-hydroxy-alpha-amino esters 3 and 4, precursors of alpha-ribosyl-diazepanone core analogues of the liposidomycins, respectively, from the beta-ketoesters 5 and 6 are described. The anti relationship between the two adjacent aminated and hydroxylated carbons was controlled by sequential hydrogenation of the beta-ketoesters in the presence of chiral ruthenium catalysts and electrophilic amination of the resulting beta-hydroxyesters. (C) 2003 Elsevier Science Ltd. All rights reserved.
Efficient asymmetric synthesis of a functionalized Δ2-pyrazoline
作者:Olivia Poupardin、Christine Greck、Jean Pierre Genet*
DOI:10.1016/s0040-4039(00)01582-3
日期:2000.11
The first asymmetric synthesis of the (4S,SR)-5-carbomethoxy-4-hydroxy-Delta (2)-pyrazoline in four steps is described starting from the methyl 4,4-dimethoxy-3-oxobutanoate by sequential catalytic hydrogenation and electrophilic amination. (C) 2000 Elsevier Science Ltd. All rights reserved.