BASE-CATALYZED CYCLIZATION AND ISOMERIZATION OF 3-PROPARGYLSELENO-1,2,4-TRIAZINE TO SELENAZOLO[3,2-B][1,2,4]-TRIAZINE

Transformation of 3-propargylseleno-6-methyl-1,2,4-triazin-5(2H)-one (2) to 3-methylene-2,3-dihydro-7H-selenazolo [3,2-b] [1,2,4] - triazin -7- one (3) and 3,6 - dimethyl-7H selenazolo [3,2-b] [1,2,4] - triazine (4) is performed under the condition of Triethylamine and sodium methoxide respectively. ?he formation of 3 and 4 may be mainly due to the high reactivity of acetylenes towards nucleophiles. Compound 4 can be formed through isomerization of 3.

MEHDI BAKAVOLI ,MAJID M HERAVI ,