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Vollhardt synthesis

For a review of these double ring closures, see Vollhardt Synthesis 1975, 765-780. [Pg.962]

The synthesis of lanosterol (140) from epoxide 139 has an Lfo, =+4. The key multiple ring-closure step 141+142- [143] in Johnson s synthesis of progesterone has also an Lfoj =+4 (Lfor for [143]- 144 would depend on the by-products). Next, we see the three steps 145+146- 147- [148]- 149 in Vollhardts synthesis of estrone with Lfor is +3, -1, +2 respectively for the overall transformatiom L r =+3-l+2=+4. The next two transformations, ISO- 151 in Nicolaou s biomimetic synthesis of endiandric acid A, and Negishi s palladium-catalyzed tetracyclization 152- 153 are also characterized by Lfor =+4. Trost s one-step polyclization... [Pg.43]

See other pages where Vollhardt synthesis is mentioned: [Pg.185]    [Pg.198]    [Pg.480]    [Pg.480]    [Pg.985]    [Pg.827]    [Pg.827]    [Pg.297]    [Pg.344]    [Pg.385]    [Pg.526]    [Pg.526]    [Pg.463]    [Pg.827]    [Pg.480]    [Pg.480]    [Pg.985]    [Pg.480]    [Pg.985]    [Pg.487]    [Pg.487]    [Pg.383]    [Pg.385]    [Pg.1]    [Pg.25]    [Pg.247]    [Pg.413]    [Pg.34]    [Pg.383]    [Pg.191]    [Pg.130]    [Pg.551]    [Pg.241]    [Pg.136]   


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Vollhardt

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