C2-Symmetric sulfur derivatives of 2,2′,3,3′-tetramethoxybiphenyl
摘要:
A practical route to prepare dithioether, thiophene and thiophene S-dioxide derivatives of 2.2 ' ,3,3 ' -tetramethoxy-1,1 ' -biphenyl 1 is described. Resolution of 6,6 ' -bis(methylithio)-3.3 ' -dimethoxy-[1,1 ' -biphenyl]-2.2 ' -diol 15 was achieved and its absolute configuration was assigned by X-ray analysis of the corresponding phosphorothioamidate diastereomer 18. (C) 2001 Elsevier Science Ltd. All rights reserved.
C2-Symmetric sulfur derivatives of 2,2′,3,3′-tetramethoxybiphenyl
摘要:
A practical route to prepare dithioether, thiophene and thiophene S-dioxide derivatives of 2.2 ' ,3,3 ' -tetramethoxy-1,1 ' -biphenyl 1 is described. Resolution of 6,6 ' -bis(methylithio)-3.3 ' -dimethoxy-[1,1 ' -biphenyl]-2.2 ' -diol 15 was achieved and its absolute configuration was assigned by X-ray analysis of the corresponding phosphorothioamidate diastereomer 18. (C) 2001 Elsevier Science Ltd. All rights reserved.
Ring-Closing Olefin Metathesis of 2,2‘-Divinylbiphenyls: A Novel and General Approach to Phenanthrenes
作者:Anna Iuliano、Paolo Piccioli、Davide Fabbri
DOI:10.1021/ol048668w
日期:2004.10.1
[reaction: see text] The ring-closing olefinmetathesis (RCM) of 2,2'-divinylbiphenyls, using a second-generation RCM ruthenium-based catalyst, leads to differently substituted phenanthrenes in quantitative yield under very mild reaction conditions, independent of both nature and position of the groups present on the biphenyl moiety.