New immonium trifluoroacetates 1 and 2 react readily with functionalized organozinc or magnesium reagents leading to the corresponding aminomethylated products of type 5 and 7. The resulting bis-allylamines were deallylated leading to primary amines.
Efficient Synthesis of β<sup>2</sup>-Amino Acid by Homologation of α-Amino Acids Involving the Reformatsky Reaction and Mannich-Type Imminium Electrophile
作者:Roba Moumne、Solange Lavielle、Philippe Karoyan
DOI:10.1021/jo060316a
日期:2006.4.1
Development of new methods for the synthesis of β-amino acids is important as polymers of these compounds are promising peptidomimetic candidates in medicinal chemistry. We report here our findings on a new and highly efficient general strategy for the synthesis of β2-amino acids by homologation of α-amino acids, involving the Reformatsky reaction and Mannich-type imminium electrophile.
We report here our findings on a new and highly efficient strategy for the synthesis of β-amino acids involving the addition of bis(O-silyl) keteneacetals on Mannich type iminium electrophiles.
Preparation of Tertiary Amines by the Reaction of Iminium Ions Derived from Unsymmetrical Aminals with Zinc and Magnesium Organometallics
作者:Veronika Werner、Mario Ellwart、Andreas J. Wagner、Paul Knochel
DOI:10.1021/acs.orglett.5b00801
日期:2015.4.17
We report a convenient one-pot preparation of polyfunctional tertiary amines, including various biorelevant phenethylamines or ephedrine derivatives, via the reaction of new functionalized iminium ions with a variety of zinc and magnesium organometallic reagents. These iminium ions were generated from unsymmetrical aminals, obtained by the in situ addition of various amides to Tietze’s iminium salt
DNA methyltransferases (DNMT) are promising drug targets in cancer provided that new, more specific, and chemically stable inhibitors are discovered. Among the non-nucleoside DNMT inhibitors, N-phthaloyl-L-tryptophan 1 (RG108) was first identified as inhibitor of DNMT1. Here, 1 analogues were synthesized to understand its interaction with DNMT. The indole, carboxylate, and phthalimide moieties were modified. Homologated and conformationally constrained analogues were prepared. The latter were synthesized from prolinohomotryptophan derivatives through a methodology based amino-zinc-ene-enolate cyclization. All compounds were tested for their ability to inhibit DNMT1 in vitro. Among them, constrained compounds 16-18 and NPys derivatives 10-11 were found to be at least 10-fold more potent than the reference compound. The cytotoxicity on the tumor, DU145 cell line of the most potent inhibitors was correlated to their inhibitory potency. Finally, docking studies were conducted in order to understand their binding mode. This study provides insights for the design of the next-generation of DNMT inhibitors.