Preparation of Thieno[2,3-b]pyrazines as Bioisosteres for Quinoxaline Derivatives wiht Reverse Transcriptase Inhibition
摘要:
Replacement of the fused aromatic moiety in GW-420867X, a HIV-1 specific nonnucleoside reverse transcriptase inhibitor, with thiophene provided 2-oxo-1,2,3,4-tetrahydrothieno[2,3-b]pyrazine derivatives. The synthesis starts with the reaction of 5-acyl-2-chloro-3-nitrothiophene and different amino acid derivatives. The resulting substitution products are reduced, cyclized and N-acylated to give the desired compounds (27 - 33).
Preparation of Thieno[2,3-b]pyrazines as Bioisosteres for Quinoxaline Derivatives wiht Reverse Transcriptase Inhibition
摘要:
Replacement of the fused aromatic moiety in GW-420867X, a HIV-1 specific nonnucleoside reverse transcriptase inhibitor, with thiophene provided 2-oxo-1,2,3,4-tetrahydrothieno[2,3-b]pyrazine derivatives. The synthesis starts with the reaction of 5-acyl-2-chloro-3-nitrothiophene and different amino acid derivatives. The resulting substitution products are reduced, cyclized and N-acylated to give the desired compounds (27 - 33).
Synthesis of Thieno[2,3-b]pyrazines via an Acylation - Deacylation Process of 3,4-Dihydro Precursors
作者:Thomas Erker、Karin Trinkl、Franz Pertlik
DOI:10.3987/com-02-9638
日期:——
In the first step 3, 4-dihydrothieno[2,3-h]pyrazines (1, 2 and 4) were N-acylated by the acyl chlorides followed by a deacylation process mediated by triethylamine to give thieno[2,3-b]pyrazines. In a final rection the excess of the appropriate acyl chlorides react with the free hydroxy residue to afford compounds (15, 16 or 17).