Novel intramolecular diels-alder reactions with alkynylthio derivatives of 1,2,4-triazines. New routes to thieno[2,3-]pyridines and thieno[2,3-]pyridines.
作者:Edward C. Taylor、John E. Macor
DOI:10.1016/s0040-4039(00)94842-1
日期:1985.1
S-Alkylation of 1,2,4-triazine-6-thiones with 4-iodobutyne, followed by oxidation to the sulfoxide and intramolecular cycloaddition (at room temperature),gives 2,3-dihydrothieno[2,3-]pyridines, which are readily dehydrated with acetic anhydride to thieno[2,3-]pyridines. The same series of reactions carried out on 1,2,4-triazine-3-thiones leads to thieno[2,3-]pyridines.
将1,2,4-三嗪-6-硫酮与4-碘丁炔进行S-烷基化,然后氧化成亚砜并进行分子内环加成(在室温下),得到2,3-二氢噻吩并[2,3- ]吡啶。容易用乙酸酐脱水成噻吩并[2,3- ]吡啶。在1,2,4-三嗪-3-硫酮上进行的相同系列反应导致噻吩并[2,3- ]吡啶。