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2005
Rings with 7 or more members
Q 0050
Practical Asymmetric Approach to Medium-Sized Carbocycles Based on the
of Two Ru-Catalyzed Transformations and a Lewis Acid-Induced
20- 068 Combination
Cyclization. — The sequential combination of Ru-catalyzed coupling and a Lewis acid
induced cyclization provides the shortest route so far described for the assembly of
enantiopure, 1,5-oxygen-bridged eight- and nine-membered carbocycles. The opening
of the oxygen-bridge is carried out under electron-transfer or in the presence of BuLi
affording the target compounds with very high enantiomeric purity (> 98%). —
(LOPEZ, F.; CASTEDO, L.; MASCARENAS*, J. L.; Org. Lett. 7 (2005) 2, 287-290;
Dep. Quim. Org., Fac. Quim., Univ. Santiago de Compostela, E-15782 Santiago de
Compostela, Spain; Eng.) — Steudel
2005
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