Reaction of tetraazathiapentalene and thiadiazolopyrimidine derivatives with heterocumulenes: Cycloaddition and elimination reactions<i>via</i>hypervalent sulfur intermediates
作者:Noboru Matsumura、Atsushi Ito、Masaaki Tomura、Yasuyuki Okumura、Kazuhiko Mizuno
DOI:10.1002/jhet.5570410116
日期:2004.1
Tetraazathiapentalene derivative 1 reacts with heterocumulenes such as diphenylketene (2) and 2-pyridylisothiocyanate (5) to give heterocycles 3, 6 and 7 with elimination of methylisothiocyanate. The reactions of thiadiazolopyrimidine derivatives 8a-b with ethoxycarbonyl isothiocyanate (9) and carbon disulfide (11) gives heterocycles 10 and 12 via thermal decomposition of 1:1 cycloadducts C and D which
四氮杂戊戊烯衍生物1与杂枯烯如二苯乙烯酮(2)和2-吡啶基异硫氰酸酯(5)反应,得到杂环3、6和7,同时消除了异硫氰酸甲酯。噻二唑并嘧啶衍生物8a-b与乙氧基羰基异硫氰酸酯(9)和二硫化碳(11)的反应通过1∶1的具有高价硫的环加合物C和D的热分解产生杂环10和12 。描述了这些反应的机理和反应性特征。