Highly Stereoselective, One-Pot Synthesis of Azetidines and 2,4-Dioxo-1,3-diazabicyclo[3.2.0] Compounds Mediated by I<sub>2</sub>
作者:Chun-Bao Miao、Chun-Ping Dong、Min Zhang、Wen-Long Ren、Qi Meng、Xiao-Qiang Sun、Hai-Tao Yang
DOI:10.1021/jo400181r
日期:2013.5.3
3-diazabicyclo[3.2.0] compounds with high stereoselectivities in a one-pot reaction mediated by I2. The tetramethylguanidine (TMG)/I2-mediated formal [2 + 2] cycloaddition reaction of α-amidomalonate 1 with enones 2 affords functionalized azetidine derivatives 4 in moderate to good yields with high diastereoselectivity. When the α-ureidomalonate 5 is used instead of 1, 2,4-dioxo-1,3-diazabicyclo[3.2.0]heptanes
我们在这里报告一种方便的方法来构建由I 2介导的一锅反应中具有高立体选择性的多取代的氮杂环丁烷和2,4-二氧代-1,3-二氮杂双环[3.2.0]化合物。α-氨基天冬氨酸盐1与烯酮2的四甲基胍(TMG)/ I 2介导的正式[2 + 2]环加成反应以中等至良好的收率提供了高非对映选择性的官能化氮杂环丁烷衍生物4。当α-ureidomalonate 5代替1,2,4-二氧代-1,3-二氮杂双环[3.2.0]庚烷8和2,4-二氧代-1,3-二氮杂双环[3.2.0]庚烯9通过控制溶剂和温度可以选择性地制备。2,4-二氧代-1,3-二氮杂双环[3.2.0]庚烷8可以进一步经历与不同的亲核试剂,以得到相应的多官能化的氮杂环丁烷衍生物的开环反应13 - 16具有高steroselectivities。