Bromination of Enamines from Tertiary Amides Using the Petasis Reagent: A Convenient One-Pot Regioselective Route to Bromomethyl Ketones
作者:Marwan Kobeissi、Khalil Cherry、Wissam Jomaa
DOI:10.1080/00397911.2013.765484
日期:2013.11.2
bromomethyl ketones is achived using the Petasis reagent (dimethyltitanocene) as a key for enamine generation. Several amides were used to test the limits of the procedure by changing either the alkyl chain R or the amino portion of the starting materials. The enamines generated in situ were allowed to react with bromine at low temperature followed by hydrolysis to yield bromomethyl ketones in excellent
摘要 使用 Petasis 试剂(二甲基二茂钛)作为烯胺生成的关键,实现了溴甲基酮的原始一锅法合成。通过改变烷基链 R 或起始材料的氨基部分,使用几种酰胺来测试该程序的限制。使原位生成的烯胺在低温下与溴反应,然后水解,以极好的收率(85% 至 95%)得到溴甲基酮。简要讨论了反应的机理细节和最佳条件。本方法提供了几个优点,例如烯胺形成的区域选择性、良好的产率、温和的反应条件和易于实验。[本文提供补充材料。去出版商'
Bicyclyl or heterobicyclylmethanesulfonylamino-substituted n-hydroxyformamides
申请人:——
公开号:US20040024066A1
公开(公告)日:2004-02-05
Compounds of formula (I):
1
R is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl or heterocyclyl; and
R
1
is bicyclyl or heterobicyclyl, are useful in the treatment and prophylaxis of conditions mediated by s-CD23.
Bicyclyl or heterobicyclylmethanesulfonylanimo-substituted N-hydroxyformamides
申请人:Best John Desmond
公开号:US20050288376A1
公开(公告)日:2005-12-29
Compounds of formula (I):
R is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl or heterocyclyl; and
R
1
is bicyclyl or heterobicyclyl, are useful in the treatment and prophylaxis of conditions mediated by s-CD23.
An easy and rapid method for the alpha-bromination of ketones using N-bromosuccinimide (NBS) catalyzed by silica gel in methanol under reflux conditions was developed. The expected products were formed in excellent isolated yields within a short period of time (5-20 min). Major advantages of the present procedure include use of inexpensive and readily available catalyst, exclusion of pre- and post-chemical treatment of catalyst and use of methanol as solvent instead of ethers and chlorinated solvents. (C) 2013 Nallagondu Chinna Gangi Reddy. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Barluenga, Jose; Llavona, Lujan; Concellon, Jose M., Journal of the Chemical Society. Perkin transactions I, 1991, # 2, p. 297 - 300
作者:Barluenga, Jose、Llavona, Lujan、Concellon, Jose M.、Yus, Miguel