Lewis acid-catalyzed tandem synthesis of 9-sulfonylamino- and 9-arylfluorenes
作者:Dayun Huang、Weiguang Yang、Jianlan Zhang、Xuesong Wang、Xinyan Wang、Yuefei Hu
DOI:10.1039/c6ra03889a
日期:——
A Lewis acid-catalyzed three-step tandem synthesis of 9-arylfluorene was developed by simply heating a mixture of 2-formyl biphenyl, TsNCO and an arene. In the absence of arene, a two-step tandem synthesis of 9-sulfonylaminofluorene was achieved. These advances were mainly attributed to the discovery of an anhydrous synthesis of N-tosyl arylaldimines from TsNCO and arylaldehydes.
One-pot synthesis of multisubstituted propenylbenzenes from benzyl chlorides through relay catalysis of palladium
作者:Haiyu Wang、Sheng Zhang、Xiujuan Feng、Xiaoqiang Yu、Masahiko Yamaguchi、Ming Bao
DOI:10.1039/d3ob00736g
日期:——
A strategy for the synthesis of multisubstituted propenylbenzenes using benzyl chlorides as starting materials is described. The palladium-catalyzed allylative dearomatization and the subsequent Wagner–Meerwein rearrangement as well as the olefin isomerization proceeded smoothly under mild conditions to produce propenylation products in good yields with high regioselectivity. Control experiments and
Composés triaromatiques, compositions les contenant et utilisations
申请人:CENTRE INTERNATIONAL DE
RECHERCHES DERMATOLOGIQUES GALDERMA (C.I.R.D. GALDERMA)
公开号:EP0879814A1
公开(公告)日:1998-11-25
L'invention conceme de nouveaux composés triaromatiques qui présentent comme formule générale (I) :
ainsi que l'utilisation de ces derniers dans des compositions pharmaceutiques destinées à un usage en médecine humaine ou vétérinaire (affections dermatologiques, rhumatismales, respiratoires, cardiovasculaires et ophtalmologiques notamment), ou bien encore dans des compositions cosmétiques.
(Biphenyl-2-alkyne) derivatives as common precursors for the synthesis of 9-iodo-10-organochalcogen-phenanthrenes and 9-organochalcogen-phenanthrenes
作者:Tamiris B. Grimaldi、Guilherme Lutz、Davi F. Back、Gilson Zeni
DOI:10.1039/c6ob01807f
日期:——
In this paper, we report our results on the cyclization of (biphenyl-2-alkyne) derivatives to give two different types of phenanthrene derivatives, 9-iodo-10-organochalcogen-phenanthrenes and 9-organochalcogen-phenanthrenes. The strategy for the synthesis was based on the use of electrophilic cyclization for the preparation of 9-iodo-10-organochalcogen-phenanthrenes and iron(III) chloride/diorganyl