Synthesis of chiral nonracemic homo-1-deoxyazasugars with D-talo-and L-allo-configuration via tandem Wittig [2+3] cycloaddition reaction
作者:Claus Herdeis、Thomas Schiffer
DOI:10.1016/0040-4020(96)00949-0
日期:1996.11
Wittig reaction of 6a,b proceeds with concomitant 1,3-dipolar cycloaddition of the azido function to the nonisolable triazoline 20 which isomerizes to diazoamine 7. Elimination of nitrogen from 7 provides vinylogous urethane 8 which can be transformed to heterocyclic β-amino acid 10 and D-homo-1-deoxyazatalose (13). Catalytic hydrogenation of 7 and manipulation of functional groups give L-homo-1-deoxyazaallose
6a,b的维蒂希反应与叠氮基官能团的1,3-偶极环加成反应发生在不可分离的三唑啉20上,该三唑啉异构化成重氮胺7。从7中除去氮可得到乙烯基氨基甲酸酯8,该乙烯基氨基甲酸酯可被转化为杂环β-氨基酸10和D-高-1-脱氧氮杂双糖(13)。7的催化加氢和官能团的操作产生L-homo-1-deoxyazaallose(16)和β-氨基酸18。