Cycloaddition ofN-(2,2,2-trichloroethylidene)-substituted carboxamides and carbamates to 1,2,4-thiadiazol-5(2H)-imines
作者:Vladimir S. Zyabrev、Mikhail A. Rensky、Eduard B. Rusanov、Boris S. Drach
DOI:10.1002/hc.10182
日期:——
1,2,4-Thiadiazol-5(2H)-imines 4 react with N-(2,2,2-trichloroethylidene)-substituted amides 5 to form [3 + 2]-cycloaddition products 6 featured by an extra coordination of the ring sulfur atom to the terminal nitrogen atom of the side 1,3-diazapropenylidene group, as established by X-ray diffraction investigation. This coordination evidently plays an important role in the alkylation of compounds 6
1,2,4-噻二唑-5(2H)-亚胺 4 与 N-(2,2,2-三氯亚乙基)-取代的酰胺 5 反应形成 [3 + 2]-环加成产物 6,其特征在于通过 X 射线衍射研究确定,环硫原子与 1,3-二氮杂亚丙基侧基的末端氮原子相连。这种配位显然在温和条件下在氧原子上将化合物 6 烷基化为 8 中起重要作用。SN 键“转换”恢复原来的 1,2,4-噻二唑环随之发生。© 2003 Wiley Periodicals, Inc. 杂原子化学 14:474–480, 2003; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002/hc.10182