๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

[5]Helicenes by iterative radical cyclisations to arenes

โœ Scribed by David C Harrowven; Michael I.T Nunn; David R Fenwick

Publisher
Elsevier Science
Year
2002
Tongue
French
Weight
61 KB
Volume
43
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

โœฆ Synopsis

The paper describes a synthesis of 1,2,3,12,13,14-hexamethoxy[5]helicene 1. The synthesis features two sp 2 -sp 2 bond forming reactions, each involving a 6-exo/endo-trig cyclisation of an aryl radical intermediate to an arene.

๐Ÿ“œ SIMILAR VOLUMES

[5]Helicenes by tandem radical cyclisati
[5]Helicenes by tandem radical cyclisation
โœ David C. Harrowven; Michael I.T. Nunn; David R. Fenwick ๐Ÿ“‚ Article ๐Ÿ“… 2002 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 115 KB

A new and rapid approach to [5]helicenes is described. A central feature is the use of a sequential, non-reducing radical cyclisation reaction of (Z,Z)-1,4-bis(2-iodostyryl)benzene derivatives, viz. 31, mediated by tributyltin hydride.

[5]Helicenes by Tandem Radical Cyclizati
[5]Helicenes by Tandem Radical Cyclization.
โœ David C. Harrowven; Michael I. T. Nunn; David R. Fenwick ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› John Wiley and Sons โš– 28 KB
Highly functionalised cyclopentanes by r
Highly functionalised cyclopentanes by radical cyclisation of unsaturated bromolactones. I preparation of 5-Deoxycarbahexofuranoses
โœ Anne Marie Horneman; Inge Lundt ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 720 KB

Three carbasugars: 5-Deoxycarba-a-t.-xylo-hexofuranose, 5-deoxycarba<t-L-lyxohexofuranose and 5-deoxycarba-f3-D-lyxo-hexofuranose have been prepared starting from readily available 2,7-dibromo-2,7-dideoxy-D-glycero-D-ido-heptono-l,4-1actone and 2,7-dibromo-2,7dideoxy-D-glycero-L-gluco-heptono-l,4-1a