Acid catalyzed intramolecular conjugate addition as a route to trans hydrindane systems
作者:Gilbert Stork、Karnail S. Atwal
DOI:10.1016/s0040-4039(00)94283-7
日期:1983.1
A stereocontrolled acid catalyzed intramolecular conjugate addition and its application in the enantioselective synthesis of trans hydrindanes are described.
作者:K. H. Baggaley、S. G. Brooks、J. Green、B. T. Redman
DOI:10.1039/j39710002671
日期:——
The hydroboration of derivatives of 6-methylbicyclo[4,3,0]non-1-en-7-one and various transformations of 6-methylbicyclo[4,3,0]non-1-ene-3,7-dione (3) have been investigated. The preparation and reactions of 2-hydroxy-6-methylbicyclo[4,3,0]non-1-ene-3,7-dione (4) are reported, including a ready synthesis of 6-methyl-cis-bicyclo[4,3,0]nonane-2,7-dione (26) and a rearrangement to give a novel dithian
Stereoselective construction of steroidal trans-hydrindanes via intramolecular ester enolate alkylation[1,2]
作者:Kim Deukjoon、Kim Sanghee、Jeong Lee Jae、Sung Kim Hak
DOI:10.1016/s0040-4039(00)94490-3
日期:1990.1
Steroidal trans-hydrindanone 6 was stereoselectively synthesized from lactol 1 in nine steps in 27% overall yield via intramolecular ester enolate alkylation methodology.
Highly stereoselective claisen rearrangement of vinyl ether of 1-(1-hydroxyethyl)-2-methyl-3-alkylcyclopentene. A route to cis- and trans (1E)-ethylidene-8-methylhydrindan-5-one.
作者:Takashi Takahashi、Haruo Yamada、Jiro Tsuji
DOI:10.1016/s0040-4039(00)86793-3
日期:1982.1
The highly stereoselective Claisen rearrangement of the α-isomer of vinyl ether of 1-(1-hydroxyethyl)-2-methyl-3-alkylcyclopentene introduces the trans stereochemistry between C(8)methyl and C(9) hydrogen and the geometry of E-olefin, necessary for a synthetic precursor of various steroids. The β-isomer gives the cis stereochemistry.
Late-Stage Molecular Editing Enabled by Ketone Chain-Walking Isomerization
作者:Yannick Brägger、Ori Green、Benjamin N. Bhawal、Bill Morandi
DOI:10.1021/jacs.3c05680
日期:2023.9.13
Herein, a method for the isomerization of ketones in a manner akin to the chain-walking reaction of alkenes is described. Widely available and inexpensive pyrrolidine and elemental sulfur are deployed as catalysts to achieve this reversible transformation. Key to the utility of this approach was the elucidation of a stereochemical model to determine the thermodynamically favored product of the reaction