共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Pyridopyrimidine reacted with aromatic aldehydes afforded the arylhydrazone 2a,b which could be cyclized into the pyrido[2,3‐d][1,2,4]triazolo[4,3‐a]pyrimidine 3a,b , with formic acid, and carbon disulphide to give pyrido[2,3‐d][1,2,4]traizolo[4,3‐a]pyrimidine 4, 5. Reaction of 1 with nitrous acid afforded tetrazolo[1,5‐a]pyrido[2,3‐d]pyrimidine 6 , which was reduced by zinc dust to give 2‐amino‐pyrido‐[2,3‐d]pyrimidine 7. Finally the reaction of 2‐hydrazino 1 with D‐xylose or D‐glucose afforded the acyclic N‐nucleoside 8, 11 which were converted into tetra/penta O‐acetate acyclic C‐nucleoside 9, 12 in acetic anhydride/pyridine. De‐acetylation of compounds 9, 12 afforded C‐nucleosides 10, 13. 相似文献
13.
Brendan Twamley PhilipP. Power 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2000,112(19):3643-3646
14.
15.
16.
17.
18.
19.