One-pot synthesis of 1-aryl-3-methyl-1,3-dienes using methallyl(trimethyl)silane and aldehydes and their low temperature (Z)→(E) isomerization induced by sulfur dioxide
摘要:
2-Methylprop-2-ene-1-sulfonyl fluorides can be easily prepared via the ene reaction of methallylsilanes and SO2. In the presence of a base, aldehydes and 2-methylprop-2-ene-1-sulfonyl fluorides give 1.3-(E) and (Z)-dienes. Their (Z) --> (E) isomerization by classical means fails or leads to their polymerization. It is shown that SO, can isomerize 1-aryl-3-methyl-1.3-dienes at low temperature, without formation of sulfolenes (cheletropic addition/elimination). Preliminary mechanistic studies suggest that SO2 adds to 1.3-dienes forming 1,4-diradical intermediates that are responsible for the (Z)-->(E) isomerizations. (C) 2004 Elsevier Ltd. All rights reserved.
MITSUDO, TAKI-AKI;FISCHETTI, W.;HECK, R. F., J. ORG. CHEM., 1984, 49, N 9, 1640-1646
作者:MITSUDO, TAKI-AKI、FISCHETTI, W.、HECK, R. F.
DOI:——
日期:——
US7582750B2
申请人:——
公开号:US7582750B2
公开(公告)日:2009-09-01
A Practical and Mild Method for the Highly Selective Conversion of Terminal Alkenes into Aldehydes through Epoxidation–Isomerization with Ruthenium(IV)–Porphyrin Catalysts
作者:Jian Chen、Chi-Ming Che
DOI:10.1002/anie.200460545
日期:2004.9.20
One-pot synthesis of 1-aryl-3-methyl-1,3-dienes using methallyl(trimethyl)silane and aldehydes and their low temperature (Z)→(E) isomerization induced by sulfur dioxide
作者:Srinivas Reddy Dubbaka、Pierre Vogel
DOI:10.1016/j.tet.2004.11.070
日期:2005.2
2-Methylprop-2-ene-1-sulfonyl fluorides can be easily prepared via the ene reaction of methallylsilanes and SO2. In the presence of a base, aldehydes and 2-methylprop-2-ene-1-sulfonyl fluorides give 1.3-(E) and (Z)-dienes. Their (Z) --> (E) isomerization by classical means fails or leads to their polymerization. It is shown that SO, can isomerize 1-aryl-3-methyl-1.3-dienes at low temperature, without formation of sulfolenes (cheletropic addition/elimination). Preliminary mechanistic studies suggest that SO2 adds to 1.3-dienes forming 1,4-diradical intermediates that are responsible for the (Z)-->(E) isomerizations. (C) 2004 Elsevier Ltd. All rights reserved.