共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
El Ashry el SH Abdel-Rahman A Rashed N Awad LF Rasheed HA 《Nucleosides, nucleotides & nucleic acids》2006,25(3):299-305
Nucleophilic displacement of the tosyloxy group in 7-(2-hydroxy-3-p-toluenesulfonyloxypropyl)theophylline (1) with azide anion afforded 7-(3-azido-2-hydroxypropyl)theophylline (2). Reduction of the 3-azido group in 2 with Ph3P/Py/NH4OH afforded the 3-amino derivative 4, alternatively obtained by regioselective amination of 7-(2,3-epoxypropyl)theophylline (3). Selective acetylation of 4 gave the N-acetyl derivative 5. 1,3-Dipolar cycloaddition of the azide group in 2 with N1-propargyl thymine (6) afforded the regioisomeric triazole 7. 相似文献
4.
D. Simon 《Engineering in Life Science》1995,15(1):55-56
5.
El Sayed H. El Ashry Adel Abdel-Rahman Nagwa Rashed Laila F. Awad Hanaa A. Rasheed 《Nucleosides, nucleotides & nucleic acids》2013,32(3):299-305
Nucleophilic displacement of the tosyloxy group in 7-(2-hydroxy-3-p-toluenesulfonyloxypropyl)theophylline (1) with azide anion afforded 7-(3-azido-2-hydroxypropyl)theophylline (2). Reduction of the 3-azido group in 2 with Ph3P/Py/NH4OH afforded the 3-amino derivative 4, alternatively obtained by regioselective amination of 7-(2,3-epoxypropyl)theophylline (3). Selective acetylation of 4 gave the N-acetyl derivative 5. 1,3-Dipolar cycloaddition of the azide group in 2 with N1-propargyl thymine (6) afforded the regioisomeric triazole 7. 相似文献
6.
Rainer Waldhardt 《Basic and Applied Ecology》2012,13(5):487
7.
8.
9.
10.
11.
Tarui H Mori N Nishida R Okabe K Kuwahara Y 《Bioscience, biotechnology, and biochemistry》2002,66(1):135-140
A new monoterpene lactone from the acarid mite, Schwiebea araujoae, was elucidated without its isolation by GC/FT-IR and GC/MS analyses to be 3-(4-methyl-3-pentenyl)-2(5H)-furanone (1) and tentatively named as alpha,alpha-acariolide. The structure of 1 was identified by its synthesis from alpha-bromo-gamma-butyrolactone via 4 reaction steps. The synthesized compound gave the same GC/MS and GC/FT-IR spectra as those of the natural product. The other monoterpene lactone was likewise elucidated from the unidentified Rhizoglyphus mite to be 4-(4-methyl-3-pentenyl)-2(5H)-furanone (2) and named as alpha,beta-acariolide; it was also identified by its synthesis in 5 reaction steps from the same butyrolactone as the starting material. GC/MS and GC/FT-IR spectra of the preparation were identical to those of the natural product. 相似文献
12.
13.
14.
15.
16.
17.
A. Post 《International Review of Hydrobiology》1977,62(1):173-174
18.
19.