N-Trifluoroacétylation sélective d'ortho-arylènediamines sous ultrasons
摘要:
Mono and di-N-trifluoroacetylation of ortho-arylenediamines can be performed selectively under ultrasound irradiation according to the relative amounts of starting materials. Mono and di-trifluoroacetylated compounds 3 and 4 are prepared with good yields in dry THF during 1 to 2 min sonication. (C) 2000 Elsevier Science Ltd. All rights reserved.
Cyclocondensation of N-(carbotrifluoromethyl)-ortho-arylenediamines leads to a series of 2-trifluoromethylarylimidazoles with good yields on montmorillonite K10 in ‘dry media’ under microwave irradiation within 2 min in a domestic oven. By conventional heating in the same conditions, no reaction is observed.
Mono and di-N-trifluoroacetylation of ortho-arylenediamines can be performed selectively under ultrasound irradiation according to the relative amounts of starting materials. Mono and di-trifluoroacetylated compounds 3 and 4 are prepared with good yields in dry THF during 1 to 2 min sonication. (C) 2000 Elsevier Science Ltd. All rights reserved.