Diversity-Oriented Synthesis of Enantiomerically Pure Steroidal Tetracycles Employing Stille/Diels-Alder Reaction Sequences
作者:Hans Wolf Sünnemann、Martin G. Banwell、Armin de Meijere
DOI:10.1002/chem.200800601
日期:2008.8.18
of bicyclo[4.3.0]nonenylstannanes cis-/trans-8 and 14 with cyclohexenol triflates 17 and 18 and subsequent Diels-Alder reactions of the resulting dienes. The enantiomerically pure bicyclo[4.3.0]nonenylstannanes cis- and trans-8 were prepared in good yields via the enol triflates cis- and trans-7, obtained from the bicyclo[4.3.0]non-2-en-3-one 5. The alkenylstannane 14 was obtained from the [2+2] cycloadduct
Stille/Diels−Alder Reaction Sequences: Diversity-Oriented Access to Novel Steroids
作者:Hans Wolf Sünnemann、Anja Hofmeister、Jörg Magull、Martin G. Banwell、Armin de Meijere
DOI:10.1021/ol062878m
日期:2007.2.1
[reaction: see text] An efficient, diversity-oriented approach to novelsteroid analogues possessing a C-5beta configuration begins with the Stille cross-coupling of enantiomerically pure cycloalkenylstannane trans-2 and enol triflate 3. The resulting diene trans-4 engages in Diels-Alder cycloaddition reactions with a range of dienophiles to give, after removal of protecting groups, biologically interesting