Tetrahedron Letters p. 8357 - 8360 (1994)
Update date:2022-08-11
Topics:
Staab, Heinz A.
Diehm, Michael
Krieger, Claus
The extension of 'proton sponges' 1 and 2 by further anellation to 1,16-diaza<6>helicene (3) was of interest to define scope and limitation of 'proton sponge' properties. 3 was prepared by photocyclisation of 2,7-bis(3-pyridylvinyl)naphthalene 4 and by Pd-catalyzed aryl-aryl coupling of the corresponding tetrabromo derivative 7.As consequence of the helical structure, 3 does not show 'proton sponge' basicity.X-ray structure analyses of 3 and 3*2HBr are in accordance with these findings.
View MoreShanghai agrotree chemical co.,ltd.
Contact:+86-21-50117563
Address:Room 8A,liangfeng building,No.8 dongfang RD.pudong,shanghai,China
Contact:+86-571-28186845
Address:Room 1224,Eastcom Mansion,398 Wensan Road,Hangzhou,310013 China
HANGZHOU ZHONGCHANG SCIENTIFIC CO.,LTD
Contact:+86-571-88932183
Address:Hangzhou
Nanjing Chemzam Pharmtech Co., Ltd.
Contact:+86-25-86462165,+86-13915979898
Address:C5-1,6 Maiyue Road,Maigaoqiao,Nanjing,Jiangsu,China
Beijing Greenchem Technology Co.,Ltd. ( Panjin Greenchem Technology Co.Ltd .)
website:http://www.bjgreenchem.com/
Contact:+86-427-6515887
Address:301,302, 3rd Floor, Building C-7, Dongsheng Science Park, Northern Territory, Zhongguancun, No. 66, Xixiaokou Road, Haidian District, Beijing
Doi:10.1016/j.bmc.2006.10.057
(2007)Doi:10.1134/S002016850811006X
(2008)Doi:10.1016/S0040-4039(00)01424-6
(1932)Doi:10.1007/BF01145562
(1987)Doi:10.1016/j.bmc.2018.03.037
(2018)Doi:10.1039/b822944a
(2009)