857775-70-3Relevant academic research and scientific papers
Diaceno[a,e]pentalenes from homoannulations of o-alkynylaryliodides utilizing a unique Pd(OAc)2/n-Bu4NOAc catalytic combination
Shen, Junjian,Yuan, Dafei,Qiao, Yan,Shen, Xingxing,Zhang, Zhongbo,Zhong, Yuwu,Yi, Yuanping,Zhu, Xiaozhang
, p. 4924 - 4927 (2015/04/27)
A heterogeneous catalytic system, Pd(OAc)2/n-Bu4NOAc, for the efficient synthesis of diaceno[a,e]pentalenes via a tandem Pd catalytic cycle is reported. The catalytic partner n-Bu4NOAc played indispensable and versatile ro
An indenone synthesis involving a new aminotransfer reaction and its application to dibenzopentalene synthesis
Katsumoto, Kenta,Kitamura, Chitoshi,Kawase, Takeshi
, p. 4885 - 4891 (2011/10/31)
o-(Phenylethynyl)phenyllithiums, generated by treatment of o-(phenylethynyl)bromobenzenes with tBuLi, were quenched with N,N-dimethylcarboamides to afford various 2-phenylindenone derivatives in moderate to good yields upon acidic workup. The choice of lithiation reagents was critical. When n-butyllithium was used the yields were reduced. The N-alkyl groups in the carboamides were also important: quenching with N,N-diethylbenzamides also afforded 2,3-diphenylindenones as the sole isolated products, but quenching with N-benzoylpiperidine led to 2-benzoyltolane in good yield. Control experiments revealed that the reactions proceed through a multi-step reaction sequence involving a novel intramolecular transamination to the α-acetylenic carbon of the alkynyl group. The method was applicable to the synthesis of dibenzopentalene derivatives as well as various indenone derivatives. A mechanism for the reaction is discussed.
Intramolecular reductive double cyclization of o,o-bis(arylcarbonyl) diphenylacetylenes: Synthesis of ladder π-conjugated skeletons
Zhang, Hongyu,Karasawa, Takashi,Yamada, Hiroshi,Wakamiya, Atsushi,Yamaguchi, Shigehiro
scheme or table, p. 3076 - 3079 (2009/12/05)
Upon the treatment of bis(arylcarbonyl)diphenylacetylenes with lithium naphthalenide, the carbonyl reduction dominantly occurs over the acetylene reduction. The produced bis(radical anion) intermediate undergoes a synchronous double-radical 5-endo-dig cyc
