Synthesis of New Stereoisomeric Nitrate Esters Derived from Isosorbide-Mononitrate II: Bicyclic δ-Lactams and Tetrahydrofuran Derivatives
作者:Zorana Tokić-Vujošević、živorad Čeković
DOI:10.1055/s-2001-17705
日期:——
The synthesis of the diastereomeric nitrate esters (3R,4R)-(2-hydroxy-4-nitrooxytetrahydrofuran-3-yloxy)acetonitrile (5b) and (3R,4S)-(2-hydroxy-4-nitrooxytetrahydrofuran-3-yloxy)acetonitrile (9) was achieved by the Beckmann fragmentation of 1,4:3,6-dianhydro-d-glucitol-5-(or -2-)nitrate-2-(or -5-)ketoximes (4b and 8), respectively. The bicyclic δ-lactams, (1R,6R,7R)-N-methyl-7-endo-nitrooxy-3-oxo-5,9-dioxa-2-azabicyclo[4.3.0]nonane (15b) and the stereoisomer (1R,6R,7S)-7-exo-nitrooxy-3-oxo-5,9-dioxa-2-azabicyclo[4.3.0]nonane (18b) were prepared by the Beckmann rearrangement of nitrones 14b and 17b, respectively. The stereoisomeric δ-lactams, N-methyl-7-endo-benzoyloxy- (15a) and N-methyl-7-exo-benzoyloxy-3-oxo-5,9-dioxa-2-azabicyclo[4.3.0]nonane (18a) were prepared from the corresponding nitrones 14a and 17a, respectively.
通过贝克曼碎裂反应,分别合成了非对映异构硝酸酯 (3R,4R)-(2-羟基-4-硝酸氧基四氢呋喃-3-氧基)乙腈 (5b) 和 (3R,4S)-(2-羟基-4-硝酸氧基四氢呋喃-3-氧基)乙腈 (9),原料为1,4:3,6-二脱水-d-葡糖醇-5-(或-2-)硝酸酯-2-(或-5-)酮肟 (4b 和 8)。双环δ-内酰胺,(1R,6R,7R)-N-甲基-7-内向-硝酸氧基-3-氧代-5,9-二氧杂-2-氮杂双环[4.3.0]壬烷 (15b) 及其立体异构体 (1R,6R,7S)-7-外向-硝酸氧基-3-氧代-5,9-二氧杂-2-氮杂双环[4.3.0]壬烷 (18b),分别由硝酮 14b 和 17b 的贝克曼重排制备。立体异构δ-内酰胺,N-甲基-7-内向-苯甲酸氧基-(15a) 和 N-甲基-7-外向-苯甲酸氧基-3-氧代-5,9-二氧杂-2-氮杂双环[4.3.0]壬烷 (18a),分别由相应的硝酮 14a 和 17a 制备。