Selective and facile deacetylation of pentacyclic triterpenoid under methanolic ammonia condition and unambiguous NMR analysis
Selective and facile deacetylation of pentacyclic triterpenoid under methanolic ammonia condition and unambiguous NMR analysis
复制标题
甲醇氨条件下五环三萜类化合物的选择性和简易脱乙酰化以及明确的 NMR 分析
DOI:
10.1016/j.cclet.2019.06.007
复制
发表时间:
2020-02
影响因子:
9.1
通讯作者:
Xiao Sulong
中科院分区:
文献类型:
--
作者:
Wang Han;Xu Renyang;Liang Shuobin;Ran Fuxiang;Zhang Lihe;Zhang Yongmin;Zhou Demin;Xiao Sulong
The acetyl ester plays an important role for protection of the hydroxyl groups in carbohydrates synthesis.In the present study,we described an efficient deprotection of acetyl group of pentacyclic triterpenoid by using methanolic ammonia in THF solution.Good selectivity for cleaving gal-C2-OAc group of 3β- hydroxy-olean-12-en-28-oic acid 28-N-2,3,4,6-tetra-O-acetyl-β-D-galactopyranoside (3) was achieved in the presence of methanolic ammonia within 4 h at low temperature (-60 °C) in a yield of 56%.The reaction disclosed here provides a new method for the synthesis of C2 selective modified carbohydrates,which is more useful than conventional synthesis procedure that usually requires many steps including temporary regioselective protection and deprotection.When the reaction temperature was increased from -60 °C to roomtemperature,the cleavage of the other three acetyl groups of galactose in an order of C4-OAc >C3-OAc >C6-OAc was observed.Based on this study,a plausible route for the deacetylation reaction has been proposed.
登录
查看更多内容
DOI:
10.1007/bf01946446
发表时间:
1984-09
期刊:
Experientia
影响因子:
--
作者:
I. Kubo;A. Matsumoto
通讯作者:
I. Kubo;A. Matsumoto
影响因子:
--
作者:
Björn Bredenkötter;U. Flörke;D. Kuck
通讯作者:
Björn Bredenkötter;U. Flörke;D. Kuck
影响因子:
3.5
作者:
Dubinsky, Luba;Krom, Bastiaan P.;Meijler, Michael M.
通讯作者:
Meijler, Michael M.
影响因子:
7.3
作者:
Yu Maorong;Si Longlong;Wang Yufei;Wu Yiming;Yu Fei;Jiao Pingxuan;Shi Yongying;Wang Han;Xiao Sulong;Fu Ge;Tian Ke;Wang Yitao;Guo Zhihong;Ye Xinshan;Zhang Lihe;Zhou Demin
通讯作者:
Zhou Demin
影响因子:
5.1
作者:
Kashiwada, Y;Wang, HK;Lee, KH
通讯作者:
Lee, KH