作者:Timo Stellfeld、Ulhas Bhatt、Markus Kalesse
DOI:10.1021/ol048720o
日期:2004.10.1
[GRAPHICS]The synthesis of the A,B,C-ring system (2) of hexacyclinic acid (1) is achieved starting from a selective Diels-Alder reaction followed by vinyl cuprate addition. The diastereoselective reduction of the ketone carbonyl at C16 could be achieved with LiAlH4. An intramolecular Michael addition established the ring system stereoselectively, providing access to the selective generation of 9 out of the 14 stereocenters of hexacyclinic acid.