Double 1,4-addition of malonate to 1,2-diaza-1,3-butadienes: a useful route to previously unknown symmetric and unsymmetric 1,6-dioxo-2,7-diazaspiro[4.4]nona-3,8-dienes
作者:Orazio A. Attanasi、Lucia De Crescentini、Paolino Filippone、Fabio Mantellini
DOI:10.1039/b009189h
日期:——
In the presence of sodium methoxide in tetrahydrofuran, 1,2-diaza-1,3-butadienes react with dimethyl malonate in a 2:1 molar ratio to give symmetric or unsymmetric bishydrazones that in turn produce new 1,6-dioxo-2,7-diazaspiro[4.4]nona-3,8-dienes, as
a consequence of a double ring closure, on treatment
with sodium methoxide in methanol.
在四氢呋喃中存在甲醇钠的情况下,1,2-二氮-1,3-丁二烯与丙二酸二甲酯以2:1的摩尔比反应,生成对称或非对称的二酰肼,这些二酰肼在甲醇中用甲醇钠处理时,由于双环合反应,进而产生新的1,6-二氧-2,7-二氮螺[4.4]壬-3,8-二烯。