Mn(III)-promoted annulation of enol ethers and esters to fused or spiro 2-cyclopentenones
作者:E.J. Corey、Arun K. Ghosh
DOI:10.1016/s0040-4039(00)95679-x
日期:1987.1
Manganese(III)-promoted addition of various 1,3-dicarbonyl compounds to enol ethers or terminal enolesters, followed by hydrolysis of the resulting adducts and base catalyzed aldol cyclization provides an effective process for the synthesis of a wide range of fused and spiro 2-cyclopentenones.
Progress toward the Synthesis of Garsubellin A and Related Phloroglucins: The Direct Diastereoselective Synthesis of the Bicyclo[3.3.1]nonane Core
作者:Sarah J. Spessard、Brian M. Stoltz
DOI:10.1021/ol025968+
日期:2002.5.1
[reaction: see text] A highly diastereoselective single-step cyclization reaction provides access to the bicyclo[3.3.1]nonane core of the polyprenylated phloroglucin natural product garsubellin A. Further elaboration to a more functionalized analogue involves a sequential Claisen rearrangement/Grubbs olefin cross-metathesis strategy. Additionally, this strategy was extended to the preparation of the
α-Methylation of ketones via manganese-enolates: Absence of undesired polyalkylation
作者:Manfred T. Reetz、Helmut Haning
DOI:10.1016/s0040-4039(00)60135-1
日期:1993.11
The transmetalation of ketone lithium-enolates using MnBr2 generates manganese-enolates which react with CH3I to provide alpha-methylated ketones with essentially no undesired polyalkylated byproducts.
COREY E. J.; GHOSH A. K., TETRAHEDRON LETT., 28,(1987) N 2, 175-178