Radical cyclization of β-allenic hydrazones. An asymmetric approach
作者:Christiane D. Bernard-Henriet、Jacques R. Grimaldi、Jacques M. Hatem
DOI:10.1016/s0040-4039(00)73075-9
日期:1994.5
beta-allenic hydrazones undergo hydrostannylation to afford cyclopentene derivatives and linear rearranged products depending on the substitution of the allenic and hydrazone moieties. A first example of asymmetric radical cyclization of a SAMP beta-allenic hydrazone is described.
GRIMALDI J.; CORMONS A., C. R. ACAD. SCI., 1979, C 289, NO 14, 373-375
作者:GRIMALDI J.、 CORMONS A.
DOI:——
日期:——
BERTRAND M.; DULCERE J. P.; GIL G.; GRIMALDI J.; SYLVESTRE-PANTHET P., TETRAHEDRON LETT. <TELE-AY>, 1976, NO 18, 1507-1508
作者:BERTRAND M.、 DULCERE J. P.、 GIL G.、 GRIMALDI J.、 SYLVESTRE-PANTHET P.
DOI:——
日期:——
Tin-Mediated Free-Radical Cyclization of β-Allenylbenzoyloximes
A set of allene-tethered benzoyloximes (5) has been treated with nBu3SnH. Depending on their substitution pattern, a wide range of compounds has been obtained. If the stannyl radical adds on the allene, the C-centred radical thus formed undergoes either a 5-exo ring closure to give the cyclopentene derivatives 7 or a 6-endo ring closure onto the N atom to give the dihydropyridines 8. If the stannyl
一组丙二烯系苯甲酰肟 (5) 已用 nBu3SnH 处理过。根据它们的取代模式,已经获得了广泛的化合物。如果甲锡基自由基加成在丙二烯上,则由此形成的以 C 为中心的自由基经历 5-外环闭合以产生环戊烯衍生物 7 或在 N 原子上进行 6-内环闭合以产生二氢吡啶 8。如果甲锡基自由基添加到苯甲酰基部分,形成亚胺基自由基,导致 3H-吡咯 9 和亚烷基-吡咯啉 10。空间效应和极性效应是控制反应过程的因素。
Kudrawcew, Walentina; Frei, Bruno; Wolf, Hans Richard, Heterocycles, 1982, vol. 17, p. 139 - 150
作者:Kudrawcew, Walentina、Frei, Bruno、Wolf, Hans Richard、Jeger, Oskar