Syntheses of enantiomerically pure furyl and thienyl -tolyl sulfoxides
摘要:
We report a highly enantioselective reaction of Grignard reagents, derived from simple furans or thiophene, with (-)-(S)-menthylsulfinate to give in high yield enantiomerically pure furyl and thienylsulfoxides.
8-Oxabicyclo[3.2.1]oct-6-en-3-ones: Application to the Asymmetric Synthesis of Polyoxygenated Building Blocks
作者:Ingo V. Hartung、H. Martin R. Hoffmann
DOI:10.1002/anie.200300622
日期:2004.4.2
efficient methods for the construction of chiral buildingblocks are crucial in modern naturalproductsynthesis. 8-Oxabicyclo[3.2.1]oct-6-en-3-ones are readily accessible scaffolds with defined stereochemical features which have been exploited for non-aldol approaches to the preparation of chiral buildingblocks. Strategies for their enantioselective synthesis, including asymmetric cycloaddition methods
Preparation of optically active 2-(or 3)(p-tolylsulfinyl)-3(or 2)furyl- or thienylcarboxaldehydes
作者:Laurent D. Girodier、Christian S. Maignan、Francis P. Rouessac
DOI:10.1016/0957-4166(95)00266-r
日期:1995.8
The preparation of the four enantiomerically pure title compounds is described by reaction of (1)-(−)-Ss-menthyl-p-toluenesulfinate on furan or thiophene precursors.
Asymmetry induction on the [4C(4π)+3C(2π)] cycloaddition reaction of C2-functionalized furans: influence of the chiral auxiliary nature
作者:Angel M Montaña、Pedro M Grima
DOI:10.1016/s0040-4020(02)00452-0
日期:2002.6
The study of the pi-facial diastereoselectivity in the [4+3] cycloaddition reaction of thirteen different chiral 2-substituted furans with oxyallyl cations, under sonochemical and/or thermal conditions, is presented. In almost all studied furans, a cis diastereoselectivity and a high endo diastereoselectivity is observed. Decreasing the distance between the closest stereocenter of the chiral auxiliary and the reactive C2-carbon of the furan ring, increases the pi-facial diastereoselectivity, especially by using chiral furyl-sulfoxides. (C) 2002 Elsevier Science Ltd. All rights reserved.