Direct nitrogenation catalyzed by early transition metal complexes

采用亲氧的早期过渡金属配合物研究了烯烃和含羟基或羰基的官能化二烯的直接氮化反应。研究了钒(V)氧三异丙醇VO(OiPr)3作为亚硝基烯反应和亚硝基diols - alder反应的催化剂。用V(V)催化剂（1mol%）氧化羟肟酸可有效生成亚硝基羰基中间体，无其他氧化副产物。羰基共轭二烯转化为亚硝基二醇加合物，产率高，具有较高的区域选择性。

The direct nitrogenation of alkenes and functionalized dienes having hydroxy or carbonyl groups was examined by using oxophilic early transition metal complexes. The vanadium(V) oxytriisopropoxide VO(OiPr)3 has been examined as catalyst for nitroso ene reaction and nitroso Diels-Alder reaction. The nitrosocarbonyl intermediates can be efficiently generated by the oxidation of hydroxamic acids with V(V) catalyst (1mol%) without any other oxygenated by-products. The conjugated dieneshaving carbonyl group were converted to the nitroso Diels-Alder adducts in good yieldswith high regioelectivity.