作者:Dieter Seebach、Manat Pohmakotr
DOI:10.1016/s0040-4020(01)93280-6
日期:——
the dianions 2, LUMO filled π-systems, from hydrogenated precursors, see schemes 1 and 2. The preparation of the allylated ketones 3a–d, of the acid derivatives 3e–h, 9, 10, 12 as well as of the dienones 11 is described. Their double deprotonation (→14, 18, 26, 30, 33, 36, and 40) is carried out by sequential treatment with potassium hydride and s-butyllithium/tetramethylethylene diamine (TMEDA) in
共轭的不饱和羰基化合物及其类似物1是1,3,5 ...-试剂。这种内在的反应性的极性转换可通过生成二价阴离子来实现2,LUMO填充π的系统中,从氢化的前体,参见方案1和2的烯丙基化的酮的制备3a-d中,将酸衍生物的图3e-H ,9,10,12以及与二烯酮的11进行说明。他们的双脱质子化(→ 14,18,26,30,33,36,和40)依次用氢化钾和仲丁基锂/四甲基乙二胺(TMEDA)在THF中进行处理。证明了钾在第二个去质子化步骤中的决定性作用(表1和eqn(6))。这些Li / K双阴离子的鲜艳悬浮液或溶液用亲电子二苯甲酮淬灭。该产品(15,20,27,31,34,37,41)的结果只从ω反应性(d 5 -和d 7的两可双阴离子亲核体(反应性)CF式2中,n = 2,3)。