1,1,3,3-tetramethyl-2-methyleneindan derivatives: syntheses with imminent rearrangement
作者:Rudolf Knorr、Johannes Freudenreich、Therese von Roman、Johann Mehlstäubl、Petra Böhrer
DOI:10.1016/s0040-4020(01)81904-9
日期:1993.1
ease of methyl migration under carbenium-like conditions, such as electrophilic bromination. The rearrangement products are described and also the methods avoiding their formation. Nucleophilic bromination of the oxirane 19 allows to efficiently prepare the sterically shielded bromoalkene 21 (Section B) or the enol acetate 34 (Section C) and other key compounds for further transformations.
据报道,由1,1,3,3-四甲基-2-茚满酮合成2,2,3,3-四甲基-1-茚二烯和1,1,3,3-四甲基-2-茚二烯衍生物。进入第二个系列的过程受到甲基化在碳酸盐状条件下(如亲电子溴化)的易行性的限制。描述了重排产物以及避免其形成的方法。环氧乙烷19的亲核溴化可以有效地制备空间屏蔽的溴代烯烃21(B部分)或烯醇乙酸酯34(C部分)以及其他用于进一步转化的关键化合物。