Generation and spectroscopic properties of syn-1,6:9,14-bismethanodicyclodeca[cd,gh]pentalene dianion
作者:Shigeyasu Kuroda、Yoshihiro Terada、Ryuta Miyatake、Yoshikazu Horino、Takako Abe、Yurie Fujiwara、Mitsunori Oda
DOI:10.1016/j.tetlet.2011.10.077
日期:2011.12
The hydrocarbon precursor, 8,16-dihydro-syn-1,6;9,14-bismethano[cd,gh]pentalene (5), to the title structure, dianion 4, was synthesized from ethyl 4-bromo-1,6-methano[10]annulene-3-carboxylate (6) in three steps, which included a nickel-catalyzed stereoselective homo-coupling, LiAlH4 reduction of the ester groups, and scandium triflate-catalyzed double intramolecular cyclization of the biarylmethyldiol
由乙基4-溴-1,6合成了标题结构为双阴离子4的烃类前体8,16-二氢-顺-1,6; 9,14-二甲基[ cd,gh ]戊烯(5)。-甲醇[10]环戊烯-3-羧酸酯(6)分三步进行,包括镍催化的立体选择性均偶联,酯基的LiAlH 4还原和三氟甲磺酸scan催化的联芳基甲基二醇的双分子内环化。去质子化5与Ñ丁基锂在THF- d 8设置4,其结构已通过NMR分析确认。1 H NMR光谱中化学位移的方面和4的计算结构确定了其变渗性。