Synthesis of ?-monosubstituted ?,?-unsaturated amides withZ-selectivity using diphenylphosphonoacetamides
作者:Satoshi Kojima、Tsugihiko Hidaka、Yuko Ohba
DOI:10.1002/hc.20054
日期:——
The utility of diphenylphosphonoacetamides [(PhO)2P(O)CH2CONRR′] as Horner–Wadsworth–Emmons reagents was examined with five different patterns of substitution upon the amide nitrogen atom (2a: R, R′ = CH2Ph; 2b: R = CH2Ph, R′ = H; 2c: R = Me, R′ = OMe; 2d: R, R′ = Ph; 2e: R, R′ = (CH2)4). The reaction of 2a was found to be Z-selective for aromatic aldehydes with selectivities up to 95:5. Reagent 2b
二苯基膦酰基乙酰胺 [(PhO)2P(O)CH2CONRR'] 作为 Horner-Wadsworth-Emmons 试剂的效用通过酰胺氮原子上的五种不同取代模式进行了检查 (2a: R, R' = CH2Ph; 2b: R = CH2Ph , R' = H; 2c: R = Me, R' = OMe; 2d: R, R' = Ph; 2e: R, R' = (CH2)4)。发现 2a 的反应对芳香醛具有 Z 选择性,选择性高达 95:5。试剂 2b 对苯甲醛 (85:15) 和 3-苯丙醛 (87:13) 都具有合理的选择性,而 2c 仅对后者的烷基醛 (83:17) 有一定的效果。与 2a 相比,化合物 2d 和 2e 的选择性略低。© 2004 Wiley Periodicals, Inc. 杂原子化学 15:515–523, 2004; 在线发表于 Wiley InterScience