Microwave-Assisted Fluorination of 2-Acylpyrroles: Synthesis of Fluorohymenidin
摘要:
Treatment of mono- and nonbrominated 2-acylpyrroles with Selectfluor under microwave conditions leads to fluorination of the pyrrole ring in the 5-position. In particular, 2-trichloroacetylated pyrrole can be fluorinated. As an example, dihydrofluorohymenidin was synthesized and dehydrogenated to fluorohymenidin as the first fluorinated pyrrole-imidazole alkaloid. Introduction of the vinyl double bond was achieved by chlorination of the 2-aminoimidazole moiety, followed by dehydrochlorination at 100 degrees C in DMF.
Microwave-Assisted Fluorination of 2-Acylpyrroles: Synthesis of Fluorohymenidin
摘要:
Treatment of mono- and nonbrominated 2-acylpyrroles with Selectfluor under microwave conditions leads to fluorination of the pyrrole ring in the 5-position. In particular, 2-trichloroacetylated pyrrole can be fluorinated. As an example, dihydrofluorohymenidin was synthesized and dehydrogenated to fluorohymenidin as the first fluorinated pyrrole-imidazole alkaloid. Introduction of the vinyl double bond was achieved by chlorination of the 2-aminoimidazole moiety, followed by dehydrochlorination at 100 degrees C in DMF.
NOVEL DIPEPTIDYL PEPTIDASE IV INHIBITORS, PROCESS FOR THEIR PREPARATION AND COMPOSITIONS CONTAINING THEM
申请人:Thomas Abraham
公开号:US20070232608A1
公开(公告)日:2007-10-04
The present invention relates to novel compounds useful as dipeptidyl peptidase IV (DPP-IV) inhibitors of the formula:
wherein X, Y, a, R
1
, and R
2
are as defined herein.