One-pot synthesis of 1,4-dihydro-3,1-benzoxazine-2-thiones by the reaction of 2-lithiophenyl isothiocyanates with aldehydes or ketones
作者:Kazuhiro Kobayashi、Yuki Yokoi、Toshihide Komatsu、Hisatoshi Konishi
DOI:10.1016/j.tet.2010.10.010
日期:2010.11
An efficient one-pot method for the synthesis of 4-monosubstituted and 4,4-disubstituted 1,4-dihydro-3,1-benzoxazine-2-thiones has been developed. Treatment of 2-bromophenyl isothiocyantes with butyllithium in THF at −78 °C generates 2-lithiophenyl isothiocyanates, which are allowed to react with various carbonyl compounds, including aldehydes, ketones, and butanolide, to give the corresponding desired
已经开发了一种有效的一锅法,用于合成4-单取代和4,4-二取代的1,4-二氢-3,1-苯并恶嗪-2-硫酮。在-78°C下用丁基锂在THF中处理2-溴苯基异硫氰酸酯,生成2-异硫苯基异硫氰酸酯,使其与各种羰基化合物(包括醛,酮和丁醇化物)反应,以中等至良好的收率得到相应的所需产物。