SYNTHESIS OF DIASTEREOMERICALLY ENRICHED CYCLIC HOMOALLYLIC ALCOHOLS USING MOLYBDENUM π-ALLYL COMPLEXES
摘要:
Condensation of CpMo(NO)(pi-allyl)I complexes bearing a tethered aldehyde gave cyclic homoallylic alcohols with a varying degree of diastereoselectivity. Cyclohexyl and tetrahydronaphthyl derivatives were prepared in moderate to good yields. The diastereoselectivity is highly dependent on the substituents on the ring.
Application of the <i>B</i>-Alkyl Suzuki−Miyaura Cross-Coupling Reaction to the Stereoselective Synthesis of Analogues of (3<i>S</i>)-Oxidosqualene
作者:Johan M. Winne、Bing Guang、Jo D'herd、Pierre J. De Clercq
DOI:10.1021/ol061962z
日期:2006.10.1
[reaction: see text] A general method is described for the direct and stereoselectivesynthesis of epoxypolyenes via Suzuki-Miyaura cross-couplingreaction of 1-iodoalkenes with B-alkylboron compounds. It allows for the straightforward and convergent assembly of compounds that are structurally similar to (3S)-oxidosqualene, an important intermediate in steroid biosynthesis.