Chemoselective annulation of 1,3-dithiin, -thiazine and -oxathiin rings on thiazoles using a green protocol
作者:Lal Dhar S. Yadav、Vijai K. Rai
DOI:10.1016/j.tet.2006.06.030
日期:2006.8
es diastereoselectively yield dithioesters, thiazol-5-ylmethyl N-aryldithiocarbamates, under solvent-free microwave irradiation conditions in a one-pot procedure. Under the same conditions, the dithioesters are chemoselectively and expeditiously annulated with montmorillonite K-10 clay, Li+-montmorillonite clay and I2 to give thiazolo-1,3-dithiins, -thiazines and -oxathiins, respectively.
3-芳基罗丹宁,芳族醛和N-芳基二硫代氨基甲酸铵的非对映选择性的串联Knoevenagel和Michael反应在无溶剂微波辐射条件下在一锅法中选择性生成二硫酸酯,噻唑-5-基甲基N-芳基二硫代氨基甲酸酯。在相同条件下,将二硫酯与蒙脱土K-10粘土,Li +-蒙脱土和I 2进行化学选择性和快速环化,分别得到噻唑洛-1,3-二硫辛,-噻嗪和-氧杂i啶。