Stereoselective Preparation of Six Diastereomeric Quatercyclopropanes from Bicyclopropylidene and Some Derivatives
作者:Malte von Seebach、Sergei I. Kozhushkov、Heiko Schill、Daniel Frank、Roland Boese、Jordi Benet-Buchholz、Dmitry S. Yufit、Armin de Meijere
DOI:10.1002/chem.200600799
日期:2007.1
Diastereomeric meso- and d,l-bis(bicyclopropylidenyl) (5) were obtained upon oxidation with oxygen of a higher-order cuprate generated from lithiobicyclopropylidene (4) in 50 and 31 % yield, respectively. Their perdeuterated analogues meso-[D(14)]- and d,l-[D(14)]-5 were obtained along the same route from perdeuterated bicyclopropylidene [D(8)]-3 (synthesized in six steps in 7.4 % overall yield from