List of used abbreviations - RosDok - Universität Rostock
List of used abbreviations - RosDok - Universität Rostock
List of used abbreviations - RosDok - Universität Rostock
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under kinetic reaction control, by attack <strong>of</strong> the terminal carbon atom <strong>of</strong> 3b onto the<br />
cationic intermediate which is predominantly present. The selective formation <strong>of</strong> 5e<br />
might be explained by steric reasons. The attack <strong>of</strong> 3a on the allyl cation occurs at its<br />
sterically less hindered carbon atom (next to the methyl group) (Scheme 5).<br />
R 1<br />
SAr OSiMe 3<br />
3a-m<br />
O OSiMe3 +<br />
Me R2 R 3<br />
4a-f<br />
OMe<br />
i<br />
17<br />
R 1<br />
SAr<br />
O<br />
Me R 2<br />
R 3<br />
5a-v<br />
OMe<br />
Scheme 3. Synthesis <strong>of</strong> 5a-v. Conditions i CH2Cl2, TiCl4 at –78 to 20 °C, 20 h.
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