Method for the Large-Scale Synthesis of Multifunctional 1,4-Dihydro-pyrrolo[3,2-<i>b</i>]pyrroles
作者:Mariusz Tasior、Olena Vakuliuk、Daiki Koga、Beata Koszarna、Krzysztof Górski、Marek Grzybowski、Łukasz Kielesiński、Maciej Krzeszewski、Daniel T. Gryko
DOI:10.1021/acs.joc.0c01665
日期:2020.11.6
thorough investigation has enabled the optimization of the synthesis of 1,4-dihydro-pyrrolo[3,2-b]pyrroles. Although salts of such metals as vanadium, niobium, cerium, and manganese were found to facilitate the formation of 1,4-dihydro-pyrrolo[3,2-b]pyrroles from amines, aldehydes, and diacetyl, we confirmed that iron salts are the most efficient catalysts. The conditions identified (first step: toluene/AcOH
彻底的研究已使1,4-二氢-吡咯并[3,2- b ]吡咯的合成最优化。尽管发现钒,铌,铈和锰等金属的盐可促进由胺,醛和二乙酰基形成1,4-二氢-吡咯并[3,2- b ]吡咯,但我们证实铁盐是最有效的催化剂。确定的条件(第一步:甲苯/ AcOH = 1:1,1 h,50°C;第二步:甲苯/ AcOH = 1:1,Fe(ClO 4)3 ·H 2 O,16 h,50°C )导致四芳基吡咯并[3,2- b ]吡咯的形成,产率为6-69%。首次出现非常富电子的取代基(4-Me 2 NC 6 H4,3-(OH)C 6 H ^ 4,吡咯-2-基)由醛始发和空间位阻的取代基(2-CLC 6 ħ 4,2- BRC 6 ħ 4,2-CNC 6 ħ 4,2-( CO 2我)C 6 H ^ 4,2-(TMS-C≡C)C 6 H ^ 4)上苯胺本可以被附加到所述吡咯并[3,2- b ]吡咯芯。现在也可以制备带有N-取代基和C的有序排列的1