Control of regioselectivity in the alkylation of 2-trimethylsilyl-2,5-dihydrothiophene 1,1-dioxide. A route for 2,2-dialkylation
作者:Hsi-Hwa Tso、Ta-Shue Chou、Wen-Cherng Lee
DOI:10.1039/c39870000934
日期:——
The readily available 2-trimethylsilyl-2,5-dihydrothiophene1,1-dioxide can be converted regioselectively into the dialkyl- and dispiro analogues, which are precursors of the corresponding 1,1-disubstituted buta-1,3-dienes and asymmetric dicycloalkylidenylethanes, respectively.
Stereoselective method for synthesizing (E)-, (E,Z)- and (E,E)-conjugated dienes via alkylation of 3-sulfolenes as key step is developed. Sex pheromones with (E)- and (E,E)-conjugated diene structures are synthesized with exclusively high stereoselectivity by applying the method.
Cross-coupling of organomanganese derivatives of 3-sulfolenes with allyl and propargyl bromides; a simple synthesis of functionalized 1,3-dienes
作者:A. N. Kasatkin、Yu. A. Prokopenko、A. M. Khabibov、G. A. Tolstikov
DOI:10.1007/bf00699145
日期:1994.1
Reactions of organomanganese compounds RMnCl (R = 3-sulfolen-2-yl or 5-methyl-3-sulfolen-2-yl) with allyl or propargyl bromides afford the corresponding 2-substituted or 2,5-disubstituted 3-sulfolenes in high yields. Thermolysis of the cross-coupling products results in 1,3,6-trienes or 1,3-dien-6-ynes.
Beyl, V.; Niederpruem, H.; Voss, P., Liebigs Annalen der Chemie, 1970, vol. 731, p. 58 - 66