Magnesium methoxide is a simple, effective and highly selective reagent for the deprotection of N-alkoxycarbonyl lactams. The cleavage occurs via six-membered ring transition states involving coordination of magnesium ion with the oxygens of the carbamate and lactam carbonyl groups.
The invention relates to novel 2-(2-chlorophenyl)-3,4-dihydro-2H-pyrrole derivatives of the formula (I)
in which
Ar represents substituted phenyl,
to a plurality of processes for their preparation and to their use as pesticides.
The invention relates to novel 2-(2-methylphenyl)-3,4-dihydro-2H-pyrrole derivatives of the formula (I)
in which
Ar represents substituted phenyl,
to a plurality of processes for their preparation and to their use as pesticides.
Stereoselective alkylation of N-Boc-2-pyrrolidinones and N-Boc-2-piperidinones. Synthesis and characterization of disubstituted lactams
作者:Adriano O. Maldaner、Ronaldo A. Pilli
DOI:10.1016/s0040-4020(99)00835-2
日期:1999.11
Alkylation of enolates of monosubstituted N-Boc lactams 4–6 afforded trans-disubstituted lactams as the major isomer. In the pyrrolidinone series, 1,3-induction seems to be ruled by steric interactions and the diastereoselection is low for the alkylation of enolates with small substituents at C-5 (e.g., Me) and methyl iodide. The trans selectivity improves with bulkier substituents at C-2 and/or bulkier
[DE] PALLADIUM-KOMPLEXE AUF DER BASIS VON PYRROLIN-METALLKOMPLEXEN<br/>[EN] PALLADIUM-COMPLEXES BASED ON PYRROLINE-METAL COMPLEXES<br/>[FR] COMPLEXES DE PALLADIUM A BASE DE COMPLEXES METALLIQUES DE PYRROLINE
申请人:BAYER AG
公开号:WO2002081489A1
公开(公告)日:2002-10-17
Neue Palladium-Komplexe der Formel (I), in welcher R1, R2 und L die in der Beschreibung angegebenen Bedeutungen haben, ein Verfahren zum Herstellen dieser Stoffe und deren Verwendung als Katalysatoren.