Scaleable Preparation of Functionalized Organometallics via Directed Ortho Metalation Using Mg- and Zn-Amide Bases
摘要:
A range of aryl and heteroaryl organometallics are efficiently prepared in THF via directed ortho metalation by using the previously reported amide bases tmpMgCl center dot LiCl (tmp = 2,2,6,6-tetramethylpiperidyl), tmp(2)Mg center dot 2LiCl and tmp(2)Zn center dot 2MgCl(2)center dot 2LiCl. These metalation reactions are carried out at 80-100 mmol scale. The unsaturated organometallic compounds undergo smooth reactions with various electrophiles, e.g. additions to carbonyl groups, Pd-catalyzed cross-coupling reactions or Cu-catalyzed acylations. In all cases, the metalation rates have been compared with corresponding small-scale reactions (1-2 mmol). Moreover, a procedure for the recovery of the valuable tmp-H from the aqueous layer is reported.
(tmp)2Zn⋅2 MgCl2⋅2 LiCl: A Chemoselective Base for the Directed Zincation of Sensitive Arenes and Heteroarenes
作者:Stefan H. Wunderlich、Paul Knochel
DOI:10.1002/anie.200701984
日期:2007.10.8
Scaleable Preparation of Functionalized Organometallics <i>via</i> Directed Ortho Metalation Using Mg- and Zn-Amide Bases
作者:Stefan H. Wunderlich、Christoph J. Rohbogner、Andreas Unsinn、Paul Knochel
DOI:10.1021/op9002888
日期:2010.3.19
A range of aryl and heteroaryl organometallics are efficiently prepared in THF via directed ortho metalation by using the previously reported amide bases tmpMgCl center dot LiCl (tmp = 2,2,6,6-tetramethylpiperidyl), tmp(2)Mg center dot 2LiCl and tmp(2)Zn center dot 2MgCl(2)center dot 2LiCl. These metalation reactions are carried out at 80-100 mmol scale. The unsaturated organometallic compounds undergo smooth reactions with various electrophiles, e.g. additions to carbonyl groups, Pd-catalyzed cross-coupling reactions or Cu-catalyzed acylations. In all cases, the metalation rates have been compared with corresponding small-scale reactions (1-2 mmol). Moreover, a procedure for the recovery of the valuable tmp-H from the aqueous layer is reported.