CYCLOADDITIONS .44. 2,3-DONOR-ACCEPTOR-SUBSTITUTED 1,3-BUTADIENES - SYNTHESIS BY SO2-EXTRUSION FROM 3-SULFOLENES AND DIELS-ALDER REACTIONS

被引:3
作者
HOFFMANN, R
MATTAY, J
BANNING, A
RODEWALD, U
MOLLER, MM
机构
[1] UNIV MUNSTER,INST ORGAN CHEM,ORLEANSRING 23,D-48149 MUNSTER,GERMANY
[2] UNIV MUNSTER,INST ANORGAN CHEM,D-48149 MUNSTER,GERMANY
来源
JOURNAL FUR PRAKTISCHE CHEMIE-CHEMIKER-ZEITUNG | 1994年 / 336卷 / 04期
关键词
D O I
10.1002/prac.19943360413
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The thermal extrusion of SO2 from disubstituted 3-sulfolenes 3 leads to 2,3-donor-acceptor-substituted 1,3-butadienes 4. These dienes react with acrylic acid ester and ethyl vinyl ether to the corresponding Diels-Alder adducts 5 and 6 and with themselves to the cyclic dimerization products 7 and 8. The regiochemistry of the cycloadducts has been determined by chemical- and NMR-methods. The pyrolysis of 3-sulfolene 11 afforded the thiolactone 13 whose structure has been verified by X-ray diffraction analysis. In addition, the influence of Lewis acid catalysts on the Diels-Alder reaction and an approach to transition state calculation by means of the semiempirical AM 1 method has also been investigated.
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页码:343 / 349
页数:7
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