Iminium carbonic acid derivative salts.<b>X</b>. Synthesis of<i>N,S</i>-containing heterobicycles from<i>N</i>-protected 2-methylthio-1,3-thiazinium and 2-methylthiothiazolium salts. Part<b>2</b>. Reaction of<i>N</i>-protected 2-methylthio-1,3-thiazinium and 2-methylthiothiazolium salts with vinylogous CH-acidic compounds
作者:Wolfgang Hanefeld、Mahmoud Naeeni、Martin Schlitzer
DOI:10.1002/jhet.5570330640
日期:1996.11
N-Boc-protected 2-methylthio-1,3-thiazinium 3 and 2-methylthiothiazolium salts 4,7 obtained from the corresponding 1,3-thiazine-2-thiones and thiazolidine-2-thiones by the action of methyl iodide or trimethyloxonium tetrafluoroborate were reacted with vinylogous CH-acidic compounds forming ketene N,S-acetals 5,6,8,9. The protection group was removed with trifluoroacetic acid whereupon the desired cyclisation
在相应的1,3-噻嗪-2-硫酮和噻唑烷-2-硫酮的作用下,通过甲基碘化物或三甲基氧鎓的作用得到N -Boc保护的2-甲硫基-1,3-噻嗪鎓盐3和2-甲硫基噻唑鎓盐4,7四氟硼酸盐用插烯CH-酸性化合物形成烯酮反应N,S -acetals -5,6,8,9-。用三氟乙酸除去保护基,然后将所需的环化成吡啶并[2,1 - b ] -1,3-噻嗪10和噻唑并[3,2- b ]吡啶11,12。