Generation of 3-methoxy-3a-methyl-3aH-indene and study of its cycloaddition reactions
作者:Thomas L. Gilchrist、Charles W. Rees、David Tuddenham
DOI:10.1039/p19810003214
日期:——
The title compound (1) has been prepared form indan-1-one by Birch reduction and methylation followed by the introduction of a further double bond, enolisation of the ketone, and O-methylation. The tetraenol ether (1) is the first 3aH-indene derivative to be isolated. It is shown to be oxidised by air to the Z-cinnamic ester (5), and to undergo ready rearrangement to the 1H-indene (7). Cycloadditions
通过桦木还原和甲基化,然后引入另外的双键,酮的烯醇化,和O-甲基化,由茚满-1-酮制备标题化合物(1)。四烯醇醚(1)是第一个要分离的3a H-茚衍生物。已显示出它会被空气氧化为Z-肉桂酸酯(5),并容易地重排为1 H-茚(7)。观察到N-苯基三唑啉二酮,偶氮二甲酸二乙酯和乙炔二羧酸二甲酯与四烯的末端环加成。这些正式的[8 + 2]环加成与N所观察到的[4 + 2]环加成相反-苯马来酰亚胺。[4 + 2]加合物在加热时发生重排,得到[8 + 2]加合物的混合物:建议该过程涉及将加合物解离成其组分并重新结合。