Regio- and stereoisomers of functionalized azido amino alcohols with a cyclopentane skeleton were synthesized in enantiomerically pure forms. Enzymatic ring cleavage of racemic 2-azabicyclo[2.2.1]hept-5-en-3-one gave the corresponding amino acid and one enantiomer of the lactam stereospecifically. These were protected by esterification and carbamoylation, and then epoxidized. The resulting oxiranes underwent cleavage by sodium azide with complementary stereoselectivities. The regioisomeric products were easily separated by crystallization or column chromatography.
功能化的
叠氮氨基醇的区域异构体和立体异构体以对映体纯净的形式合成。非对映体的
2-氮杂双环[2.2.1]庚-5-烯-3-酮经过酶促断环反应生成相应的
氨基酸和一个对映体的内酰胺,并具有立体选择性。这些化合物通过酯化和
氨基甲酰化被保护,随后进行了环氧化。所得的环氧化合物与
叠氮化
钠发生了互补的立体选择性裂解。区域异构体产物通过结晶或柱色谱法易于分离。