期刊
TETRAHEDRON
卷 67, 期 51, 页码 9957-9965出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2011.09.078
关键词
Acetylenic sulfone; alpha-Addition; beta-Addition; Displacement; Conjugate addition; Chelation effect; Isomerization; trans-Elimination
资金
- National Science Council, Taiwan
- National Tsing Hua University
Methoxy-arylacetylenic sulfones were examined to react with various carbanion nucleophiles to result in the three types of products; thus, (i) nucleophiles (MeLi center dot LiBr, Vinyl MgBr, LiCH2CN) showed the a-addition, however, (ii) Li-C C TMS afforded beta-addition (conjugate addition) products. The (iii) displacement reaction through alpha-addition/isomerization/trans-elimination was enhanced by the presence of ortho-methoxy group at high temperature. The heteroatom nucleophiles (nitrogen, oxygen or sulfur atom) in a protic solvent provided only conjugate addition products as reported. (C) 2011 Elsevier Ltd. All rights reserved.
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