Palladium-catalyzed intermolecular carboazidation of allenes with aryl iodides and trimethylsilyl azide
作者:Hao-Ming Chang、Chien-Hong Cheng
DOI:10.1039/b004524l
日期:——
undergo carboazidation with aryl iodides and (CH3)3SiN3 in good to excellent yields. For n-butyl-, cyclopentyl- and cyclohexylallene (1b–d), carboazidation gives three isomers 5, 6 and 7 in ca. 1∶1∶1 ratio. For phenyl- and phenoxyallene (1e and f), the reaction produces two stereoisomers Z- (5) and E-CHRC(Ar)CH2N3 (6), where R = Ph and PhO; the regioisomer RCH(N3)C(Ar)CH2 (7) was not observed. In contrast
碳酰叠氮合成高取代烯丙基叠氮的新方法。 丙二烯描述了由钯络合物催化的。治疗1,1-二甲基丙二烯(1a)与芳族碘化物ArI 2(4-CH 3 COC 6 H 4 I,4-CH 3 OC 6 H 4 I,3-CH 3 OC 6 H 4 I,4-CH 3 C 6 H 4 I, 3-CH 3 C 6 H 4 I,3-C 2 H 5 OCOC 6 H 4 I,4-C 2 H 5 OCOC 6 H 4 I,4-ClC 6 H 4I,3-BrC 6 H 4 I或1-碘噻吩),(CH 3)3 SiN 3和KOAc在Pd(dba)2(dba = 二亚苄基丙酮)在70°C的DMF中以良好至极好的收率得到了两个区域异构体(CH 3)2 CC(Ar)CH 2 N 3 3和(CH 3)2(N 3)CC(Ar)CH 2 4。从这些反应中观察到的烯丙基叠氮化物的区域和立体异构体比率接近于这些异构体在环境温度下的平衡比率,这是由于苯甲酸酯的快速1