carbo[5]helicenes and monoaza[5]helicenes emphasizes the importance of the “shape factor” (responsible of the isomorphism between some species in the series) as well as the lack of a unique supramolecular effect organizing the molecules in the crystals (responsible for the polymorphism observed for some compounds).
A Straightforward Route to Helically Chiral N-Heteroaromatic Compounds: Practical Synthesis of Racemic 1,14-Diaza[5]helicene and Optically Pure 1- and 2-Aza[6]helicenes
作者:Jiří Míšek、Filip Teplý、Irena G. Stará、Miloš Tichý、David Šaman、Ivana Císařová、Pavel Vojtíšek、Ivo Starý
DOI:10.1002/anie.200705463
日期:2008.4.14
A Versatile Synthesis of Functionalized Pentahelicenes
作者:Olivier Songis、Jiří Míšek、Markus B. Schmid、Adrian Kollárovič、Irena G. Stará、David Šaman、Ivana Císařová、Ivo Starý
DOI:10.1021/jo1013977
日期:2010.10.15
A general synthetic methodology for the preparation of functionalized (hetero)helicenes has been developed It employs the sequence or a double propargyl ganometallics (Li, Mg, Ga/In) addition to it tolan-2.2'-dialdehyde-type intermediate. a cobalt-catalyzed/cobalt-media led [2 + 2 + 2] cycloisomerization of a triyne intermediate,and a double silica gel-assisted acetic acid elimination to receive pentahelicene, 1,14-diazapentahelicene. and 3,12-dichloro-, 3 12-dichloro-7trimethylsilyl- and 3,12-di-tert-butylpentahelicene 3,12-Dichloropentahelicene undergoes a Suzuki-Miyam a coupling with aryl boronic acids (or ester) under palladium catalysis to afford 3-12-diarylpentahelicenes
Staab, Heinz A.; Zirnstein, Michael A.; Krieger, Claus, Angewandte Chemie, 1989, vol. 101, # 1, p. 73 - 75
作者:Staab, Heinz A.、Zirnstein, Michael A.、Krieger, Claus