作者:Vitomir Šunjić、Zdenko Hameršak、Mladen Litvić、Dragan Šepac、Andreja Lesac、Zlata Raza
DOI:10.1055/s-2002-34835
日期:——
On deprotonation by lithium bistrimethylsilylamide (LBTSA), 2-phthalimidoacetophenone (1) is quantitatively converted to 6H,12H-isoindolo [2,1-a]-6,7a-dihydroxyquinolin-12-one (2); weaker bases proved much less effective. Thermal dehydration of 2 to vinilogous imide 3, then the AlCl3-catalyzed aminolysis by (1S)-arylethylamines afforded (1S)-amides of 2-(2′-carboxyphenyl)-4-hydroxyquinolines (5-7). This sequence represents an efficient assembling of novel chiral heterocycles, potentially useful in enantioselection as ligands or chiral selectors. In situ prepared Pd(II) complexes of 5-7 exhibited catalytic activity in allylic alkylation of 1,3-diphenyl-1-acetoxyprop-2-ene (8) by dimethylmalonate anion; the complex of 7 afforded the highest (64%) enantiomeric excess of 1,3-diphenyl-1-dimetylmalonylprop-2-ene (9).
在双三甲基硅烷基锂酰胺(LBTSA)的去质子化作用下,2-邻苯二甲酰亚胺基苯乙酮(1)定量转化为 6H,12H-异吲哚并[2,1-a]-6,7a-二羟基喹啉-12-酮(2);事实证明,弱碱的效果要差得多。 热脱水 2 得到乙烯基亚胺 3,然后在 AlCl3 催化下用 (1S)- 芳基乙胺进行氨解,得到 (1S)- 2-(2′-羧基苯基)-4-羟基喹啉的酰胺 (5-7)。 该序列代表了一种新型手性杂环的高效组装方法,可用于对映体选择配体或手性选择器。原位制备的 5-7 钯(II)配合物在二甲基丙二酸阴离子对 1,3-二苯基-1-乙酰氧基丙-2-烯(8)的烯丙基烷基化反应中表现出催化活性;7 的配合物得到了对映体过量率最高(64%)的 1,3-二苯基-1-二甲基丙二酸丙二酯(9)。