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.