Add time:07/30/2019         Source:sciencedirect.com

Exclusive formation of either 2- or 4-trifluoromethyl(1H,5)arylodiazepines (5,7)(6,8) was observed in the condensation of 1,1,1-trifluoro-3-(isobutoxymethylene)-2-propanones 23 with o-arylenediamines 4 under microwave irradiation conditions. Thermal reactions under the same temperature and time produced no products. Orthoaminophenols 9 and o-aminothiophenol 12 with 2 and 3 under the same conditions produced the respective oxazepines 10,11 and thiazepines 13,14. The synthetic equvalent 1 gave similarly benzimidazoles 15, benzoxazoles 16 and benzthiazoles 17.

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