Electron-rich heteroaroylphosphonates and their reaction with trimethyl phosphite
作者:D. Vaughan Griffiths、Mohamad J. Al-Jeboori、Yuen-Ki Cheong、Philip Duncanson、Jayne E. Harris、Michael C. Salt、Helen V. Taylor
DOI:10.1039/b717130g
日期:——
reactions with trimethyl phosphite investigated. Deoxygenation of the carbonyl groups in these heteroaroylphosphonates occurs to give carbene intermediates, which then undergo further reaction. In the case of the furan-3-oylphosphonates and those systems containing a thiophene or pyrrole ring, the major reaction pathway involves intermolecular trapping of the carbene intermediates by the trimethyl phosphite
制备了基于噻吩,吡咯或呋喃的二烷基杂芳基膦酸酯,并研究了它们与亚磷酸三甲酯的反应。这些杂芳基膦酸酯中的羰基进行脱氧,得到卡宾中间体,然后使其进一步反应。对于呋喃-3-酰基膦酸酯和含有噻吩或吡咯环的系统,主要的反应途径涉及亚磷酸三甲酯对卡宾中间体的分子间捕集,从而导致可以容易地转化为羟基的膦酸酯形成。相应的1,1-双膦酸酯。但是,在某些呋喃-2-酰基膦酸酯中,生成的碳烯会开环,最初生成无环炔基膦酸酯,后者可能进一步反应生成其他新型磷化合物。已经研究了取代基对最初形成的卡宾的分子间俘获与分子内重排竞争的程度的影响。后者的过程似乎被呋喃环的5位上的取代基所抑制,所得的膦酸膦酸酯是呋喃-2-基卡宾有效分子间捕集的罕见例子。