Reactivity of fluorinated sulfur-containing heterocycles towards nucleophilic and oxidizing reagents
作者:Viacheslav A. Petrov、Steve Lustig、Will Marshall
DOI:10.1016/j.jfluchem.2007.05.009
日期:2007.10
2-bis(trifluoromethyl)-3,6-dihydro-4,5-dimethyl-2H-thiopyran with i-C3H7MgCl leads to the formation of ring opening products as the result of nucleophilic attack of the Grignard reagent on the sulfur atom. According to DFT calculations the reactivity of the sulphur-containing substrate correlates with the strain energy of the heterocycle. The oxidation of 3-thia-4,4-bis(trifluoromethyl)tricyclo[5.2.1.02,5]non-7-ene
5,5-双(三氟甲基)-6-硫杂双环[2.2.1]庚-2-烯,5,5-双(三氟甲基)-6-硫杂双环[2.2.2] oct-2的反应烯和2,2-双(三氟甲基)-3,6-二氢-4,5-二甲基-2 H-硫代吡喃与i -C 3 H 7 MgCl的形成是由于亲核攻击导致开环产物的形成格氏试剂对硫原子的影响。根据DFT计算,含硫底物的反应性与杂环的应变能相关。-3-硫杂-4,4-二(三氟甲基)三环[5.2.1.0的氧化2,5- ]壬-7-烯通过过氧化氢在六氟异丙醇溶剂导致形成相应的亚砜,但反应和间氯过氧苯甲酸产生硫和双键的彻底氧化产物。与之形成鲜明对比的是,5,5-双(三氟甲基)-6-硫杂双环[2.2.1]庚-2-烯和5,5-双(三氟甲基)-6-硫杂双环[2.2.2]的氧化MCPBA(2d,25°C)使] oct-2-ene进行双键的保留,导致相应砜的选择性形成。
SCHWAB M.; SUNDERMEYER W., CHEM. BER., 119,(1986) N 8, 2458-2465