作者:Toru Minami、Susumu Inoue、Tatsuo Okauchi
DOI:10.1055/s-2003-41002
日期:——
Palladium-catalyzed cross-coupling reaction of α-phosphonovinyl nonafluorobutanesulfonates (nonaflates) 1 with dialkyl phosphites gave versatile intermediate reagents, gem-bis(phosphono)ethylenes 2a-d in 35-93% yields. The reaction of bis(diethylphosphono)ethylene (2a) with tribromomethyllithium to give the Michael adduct 3 was followed by treatment with potassium hydride to form 1,1-dibromo-2,2-bis(phosphono)cyclopropane 4 in 68% yield. The reaction of 2a with [N-(p-toluenesulfonyl)- or N-(methanesulfonyl)imino]phenyliodinane produced the corresponding 1-sulfonyl-2,2-bis(phosphono)aziridines 5a,b in 54-75% yields. Treatment of 2a with sodium or potassium imidazole and a halogenating agent led to [1-halo-2-(1-imidazolyl)ethyl]-1,1-bisphosphonates 7a,b (halogen = Cl, F) in 73-47% yields. Similar reaction using 3-lithiopyridine and a halogenating agent afforded [1-halo-2-(3-pyridyl)ethyl]-1,1-bisphosphonates 8a,b in 83-85% yields.
钯催化的α-磷酸乙烯基全氟丁烷磺酸酯(nonaflates)1与二烷基磷酸酯的交叉偶联反应生成了多用途的中间试剂,gem-双(磷酸)乙烯2a-d,产率为35-93%。二(乙基磷酸)乙烯(2a)与三溴甲基锂的反应生成迈克尔加成物3,随后用氢化钾处理,得到1,1-二溴-2,2-双(磷酸)环丙烷4,产率为68%。2a与[N-(对甲苯磺酰)-或N-(甲烷磺酰)亚氨基]苯碘烯的反应生成相应的1-磺酰-2,2-双(磷酸)呋喃5a,b,产率为54-75%。2a与钠或钾咪唑和卤化剂的处理生成了[1-卤-2-(1-咪唑基)乙基]-1,1-双磷酸酯7a,b(卤素 = Cl, F),产率为73-47%。类似地,使用3-锂吡啶和卤化剂的反应得到[1-卤-2-(3-吡啶基)乙基]-1,1-双磷酸酯8a,b,产率为83-85%。