A Kulinkovich Entry into Tertiary N-Acyliminium Ion Chemistry
摘要:
[GRAPHICS]Subjection of N-alkenylimides to Kulinkovich cyclopropanation conditions led to different types of N,O-acetals, which were used as precursors for tertiary N-acyliminium ion chemistry. In this way, a variety of bi- and tricyclic lactams were efficiently synthesized.
Titanium- and Lewis Acid-Mediated Cyclopropanation of Imides
作者:Philippe Bertus、Jan Szymoniak
DOI:10.1021/ol062938o
日期:2007.2.1
We report a straightforward synthesis of 1-azaspirocyclopropane lactams from imides. Following the described procedure, polycyclic nitrogenheterocycles containing a cyclopropane unit could be obtained from unsaturated imides. [reaction: see text].
Novel route to fused nitrogen heterocycles by olefin metathesis
作者:Stephen F. Martin、Yusheng Liao、Hui-Ju Chen、Michael Pätzel、Melissa N. Ramser
DOI:10.1016/0040-4039(94)88060-3
日期:1994.8
A novel technique for the efficient synthesis of fused nitrogen heterocycles has been developed that features the molybdenum alkylidene-catalyzed metathesis of α,ω-dienes containing a nitrogen atom in the chain linking the two olefinic functional groups. The starting materials may be readily prepared in three steps from succinimide and glutarimide via sequential Mitsunobu alkylation, sodium borohydride