Synthesis and spectroscopic analysis of acyclic C-nucleosides and homo-C-analogues from 1-(chloroalkyl)-1-aza-2-azoniaallene salts
作者:Najim A. Al-Masoudi、Yaseen A. Al-Soud、Armin Geyer
DOI:10.1016/s0040-4020(98)01080-1
日期:1999.1
α′-dichloroazo compounds 1 with SbCl5 afforded the 1-(chloroalkyl)-1-aza-2-azoniaallene salts (2) which reacted in a 1,3-dipolar cycloaddition with the acetoxy nitriles 3 and 4 to the 1,2,4-triazolium salts 5 and 6, respectively. 5 and 6 rearranged spontaneously to the protonated 1,2,4 triazoles 7 and 8, respectively. The salts 7 were in situ hydrolyzed to the acyclic 1,2,4-triazole C-nucleosides 9 which
用SbCl 5处理α,α'-二氯偶氮化合物1,得到1-(氯烷基)-1-氮杂-2-氮杂苯丙烯盐(2),其在1,3-偶极环加成中与乙酰氧基腈3和4反应生成1,2,4-三唑鎓盐5和6。5和6分别自发地重排成质子化的1,2,4三唑7和8。盐7被原位水解成无环的1,2,4-三唑C-核苷9,得到游离的核苷11a,b,以及解封后的f。用NaOMe处理8导致脱乙酰化以及盐水解成游离的同核苷13a-f。