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23. A typical procedure is as follows: The methane tricarboxylate, enone 1b, tetrabutylammonium hydrogen sulphate, potassium carbonate and toluene were mixed and stirred at 60°C for 3h. The mixture was cooled to room temperature, diluted with water and extracted with ether. The resulting oil was purified by flash chromatography.
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-
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26
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85030207706
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note
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24. All new compounds gave satisfactory spectroscopic and high resolution mass spectrometric or analytical data.
-
-
-
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27
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85030199913
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note
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+, 100%). The regioselectivity of this addition is given by the 2Hz allylic coupling constant observed between H-4 and H-6.
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-
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28
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85030209080
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note
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4Cl, and the solution extracted with dichloromethane. The products were obtained by flash chromatography.
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29
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