An efficient green protocol for the preparation of acetoacetamides and application of the methodology to a one-pot synthesis of Biginelli dihydropyrimidines. Expansion of dihydropyrimidine topological chemical space
作者:Fernando H. S. Gama、Rodrigo O. M. A. de Souza、Simon J. Garden
DOI:10.1039/c5ra14355a
日期:——
A one pot synthesis of Biginelli dihydropyrimidines. The novel use of the amino acids allows topological diversification of the chemical space.
一锅法合成Biginelli双氢嘧啶化合物。氨基酸的新颖应用使化学空间具有拓扑多样性。
One-Pot Two-Step Microwave-Assisted Synthesis of Alkylidene Acetoacetamido Esters, Useful Intermediates for β-Dehydropeptides
Alkylidene acetoacetamides are useful building blocks for the preparation of a number of biologically active derivatives, including dehydro-β-amino-acid-containing peptidomimetics. A one-pot two-step protocol for the preparation of amino-acid-derived unsaturated acetoacetamides has been optimized. The use of microwave activation avoids, or at least decreases, the need for catalysts in both steps. A
Novel Synthetic Approach to 6,7-Dihydro-5<i>H</i>-imidazo[1,5-a]-pyrazin-8-ones
作者:Ariamala Gopalsamy、Mengxiao Shi
DOI:10.1021/ol035455i
日期:2003.10.1
[GRAPHICS]A novel route to highly substituted chiral 6,7-dihydro-5H-imidazo[1,5-a]pyrazine-8-ones starting from Meldrum's acid is disclosed. The key features of the methodology are the incorporation of amino esters as a chiral pool and facile mild intramolecular cyclization to form the pyrazine ring. Incorporation of various substituents at different stages of the synthesis from various building block sets makes this methodology readily amenable to parallel synthesis.