通过使用钌介导的异构化和钌的合成,证明了将芳基烯丙基醚和芳基烯丙基用作掩蔽的乙烯基醚和1-丙烯基苯基用于闭环复分解(RCM),导致合成苯并稠合的杂环。介导的RCM反应。这导致了多种产物的合成,包括两种取代的苯并[1,4]二恶英,萘并[2,3- b ] [1,4]二恶英,2 H-色烯和苯并[ b ]呋喃。
通过使用钌介导的异构化和钌的合成,证明了将芳基烯丙基醚和芳基烯丙基用作掩蔽的乙烯基醚和1-丙烯基苯基用于闭环复分解(RCM),导致合成苯并稠合的杂环。介导的RCM反应。这导致了多种产物的合成,包括两种取代的苯并[1,4]二恶英,萘并[2,3- b ] [1,4]二恶英,2 H-色烯和苯并[ b ]呋喃。
A versatile catalyst system for enantioselective synthesis of 2-substituted 1,4-benzodioxanes
作者:Eugene Chong、Bo Qu、Yongda Zhang、Zachary P. Cannone、Joyce C. Leung、Sergei Tcyrulnikov、Khoa D. Nguyen、Nizar Haddad、Soumik Biswas、Xiaowen Hou、Katarzyna Kaczanowska、Michał Chwalba、Andrzej Tracz、Stefan Czarnocki、Jinhua J. Song、Marisa C. Kozlowski、Chris H. Senanayake
DOI:10.1039/c8sc05612a
日期:——
We report the synthesis of enantiomerically enriched 1,4-benzodioxanes containing alkyl, aryl, heteroaryl, and/or carbonyl substituents at the 2-position. The starting 1,4-benzodioxines were readily synthesized via ring closing metathesis using an efficient nitro-Grela catalyst at ppm levels. Excellent enantioselectivities of up to 99:1 er were obtained by using the versatile catalyst system [Ir(c
Synthesis of unsaturated 1,4-heteroatom-containing benzo-fused heterocycles using a sequential isomerization–ring-closing metathesis strategy
作者:Garreth L. Morgans、E. Lindani Ngidi、Lee G. Madeley、Setshaba D. Khanye、Joseph P. Michael、Charles B. de Koning、Willem A.L. van Otterlo
DOI:10.1016/j.tet.2009.10.061
日期:2009.12
A small library of 1,4-benzodioxins and 4H-1,4-benzoxazines was synthesized from the corresponding bis-allyloxy precursors by way of an initial isomerization to the bis-vinyloxy compounds, followed by a ring-closing metathesis using the second generation Grubbs' catalyst (G2). A related strategy, starting from benzene-1,2-dithiol and 2-mercaptophenol, afforded benzodithiin and 1,4-benzoxathiin, respectively. (C) 2009 Elsevier Ltd. All rights reserved.
Krompiec; Kuznik; Bieg, Polish Journal of Chemistry, 2000, vol. 74, # 8, p. 1197 - 1200