作者:Apurba Sinhamahapatra、Narottom Sutradhar、Malay Ghosh、Hari C. Bajaj、Asit B. Panda
DOI:10.1016/j.apcata.2011.05.032
日期:2011.7
the presence of appreciable amount of Brönsted acid sites. The synthesized m-SZ showed high catalytic activity towards protection of carbonyl compounds through acetal/ketalformation. For the open ketal (from cyclohexanone and methanol) 97% conversion with 100% selectivity was obtained in 1 h at room temperature under solvent free condition. The catalyst can be easily recycled after separation from
报道了一种新颖,方便,一步合成的方法,该方法使用碳酸锆配合物合成中孔硫酸盐氧化锆(m-SZ),并将其用作固体酸催化剂,用于不同羰基化合物的缩醛化。通过在550°C下煅烧6小时除去表面活性剂(十六烷基甲基溴化铵,CTAB),可实现m-SZ的高BET比表面积(234 m 2 g -1)。显微镜分析表明存在带有蠕虫状孔的球形颗粒。吡啶吸附的m-SZ和NH 3的DRIFT(漫反射FTIR)-TPD(程序升温脱附)分析表明存在大量的布朗斯台德酸位。合成的m-SZ对通过缩醛/缩酮形成保护羰基化合物具有高催化活性。对于开环缩酮(来自环己酮和甲醇),在室温下于无溶剂条件下,在1小时内可获得97%的转化率和100%的选择性。从反应体系中分离出来的催化剂可以很容易地循环利用,而催化活性没有明显的损失。
McClelland, Robert A.; Engell, Karen M.; Larsen, Truels S., Journal of the Chemical Society. Perkin transactions II, 1994, # 10, p. 2199 - 2206
作者:McClelland, Robert A.、Engell, Karen M.、Larsen, Truels S.、Soerensen, Poul E.
DOI:——
日期:——
(1S,2S,3R,6R)-6-Aminocyclohex-4-ene-1,2,3-triol (= (−)-Conduramine B-1) Is a Selective Inhibitor ofα-Mannosidases. Its Inhibitory Activity Is Enhanced byN-Benzylation
作者:Robert Łysek、Catherine Schütz、Pierre Vogel
DOI:10.1002/hlca.200590220
日期:2005.10
(−)- and (+)-ConduramineB-1 ((−)- and (+)-5, resp.) have been derived from (+)- and (−)-7-oxabicyclo[2.2.1]hept-5-en-2-one (‘naked sugars’ of the first generation). Although (−)-5 imitates the structure of β-glucosides, it does not inhibit β-glucosidases but inhibits α-mannosidases selectively. N-Benzylation of (−)-5 improves the potency of conduramine B-1 as α-mannosidase inhibitor and also generates