N-Boc-protected 2-memylthio-1,3-thiazinium 1 and 2-methylthiothiazolium iodides 2, 3 obtained from the corresponding 3,4,5,6-tetrahydro-2H-1,3-thiazine-2-thiones and thiazolidine-2-thiones by the action of methyl iodide were reacted with 3-armno-2-cyano-3-arylacrylonitriles forming the cyclic isothioureas 5–7. The protection group was removed with trifluoroacetic acid whereupon the desired cyclisation
Ñ -Boc保护的2- memylthio -
1,3-噻嗪1和2-methylthiothiazolium
碘化物2,3从相应的3,4,5,6-四氢-2-获得ħ -
1,3-噻嗪-2-硫酮和
噻唑烷-2-
硫酮在甲基
碘的作用下与3-armno-2-cyano-3-芳基
丙烯腈反应形成环状异
硫脲5-7。用
三氟乙酸除去保护基,然后将所需的环化成3,4-二氢-2 H,6 H-
嘧啶基[ 2,1- b ] [1,3]
噻嗪8a-c,8a'-c'和
噻唑罗发生了[3,2- b ]
嘧啶9a,b,9a′,b′,10a,b。