The scope and limitation of the [1,4]-SPh shift in the synthesis of allylic alcohols†
作者:Varinder K. Aggarwal、Jason Eames、Maria A. de las Heras、Sara McIntyre、Stuart Warren
DOI:10.1039/b005349j
日期:——
Treatment of a series of 4-phenylsulfanyl-1,3-diols with toluene-p-sulfonyl chloride in pyridine gives stereospecifically substituted allylicalcohols in near quantitative yield via a [1,4]-SPh shift. We comment on the structural variation at both the migration origin and terminus on the outcome of the title reaction and define its limits.
Synthese de composes dicarbonyles-1,4 par reaction de Wittig sur des aldehydes, la methode peut etre etendue a la synthese de composes tricarbonyles-1,4,7
Synthese de composes dicarbonyles-1,4 par 反应 de Wittig sur des aldehydes, la methode peut etre etendue a la synthese de composes tricarbonyles-1,4,7
<scp>l</scp>-Proline-Catalyzed Direct Intermolecular Asymmetric Aldol Reactions of 1-Phenylthiocycloalkyl Carboxaldehydes with Ketones. Easy Access to Spiro- and Fused-Cyclobutyl Tetrahydrofurans and Cyclopentanones
作者:Angela M. Bernard、Angelo Frongia、Regis Guillot、Pier P. Piras、Francesco Secci、Marco Spiga
DOI:10.1021/ol063084a
日期:2007.2.1
[reaction: see text] Acid-catalyzed ring expansion of chiral cyclopropyl and cyclobutyl derivatives for the synthesis of carbo- and heterocyclic compounds is reported. The starting materials have been successfully prepared by l-proline-catalyzed directasymmetricaldolreactions of 1-phenylthiocycloalkyl carboxaldehydes with ketones.
The stereoselective synthesis of oxetanes; exploration of a new, Mitsunobu-style procedure for the cyclisation of 1,3-diols
作者:Martin Christlieb、John E. Davies、Jason Eames、Richard Hooley、Stuart Warren
DOI:10.1039/b106851b
日期:2001.11.15
A solution of 2-methyl-3-[1-(phenylsulfanyl)cyclohexyl]propane-1,3-diol 1 in toluene treated with triphenylphosphine, Ziram®
2 and DEAD, gave 3-methyl-2-[1-(phenylsulfanyl)cyclohexyl]oxetane 3 in 85% yield. A mechanistic study has been undertaken, optimal conditions have been found and the range of substrates for which the reaction is useful has been explored. We include the results of an X-ray study which shows that compound 33 (the oxidation product of diol 1) is a sulfone rather than a sulfoxide as previously reported.
Synthesis of cyclic sulfides using phenylthio migration
作者:Jason Eames、Ray V.H. Jones、Stuart Warren
DOI:10.1016/0040-4039(95)02248-1
日期:1996.1
New routes to cyclic and spirocyclic sulfides involve aldol reactions of dithioesters or chemoselective Mitsunobu reactions on diols to give 2-hydroxyalkylsulfides with a terminal SH group. Treatment with acid gives cyclic sulfides, or by rearrangement with PhS migration, spirocyclic sulfides or allylic sulfides in good yield.