A route to enantiomerically pure 5-(2′-hydroxyethyl)cyclopent-2-en-1-ol and its absolute configuration by Mosher esters
作者:Hao Chen、Srinivas Nagabandi、Steven Smith、Jonathan M. Goodman、Erika Plettner
DOI:10.1016/j.tetasy.2009.02.007
日期:2009.3
The (+/-)-5-(2'-hydroxyethyl)cyclopent-2-en-1-ol 1 was prepared in a one-pot procedure, and was resolved using lipase AK and vinyl acetate with high ee. This provides a readily available chiral synthon for the synthesis of a wide variety of biologically interesting molecules. Further, the absolute configuration of diol 1 was confirmed directly by the Mosher ester method. (c) 2009 Elsevier Ltd. All rights reserved.
Formal Synthesis of (±)-Mitsugashiwalactone and (±)-Isodihydronepetalactone from Norborn-5-en-2-one Involving Shapiro Reaction
作者:Meng-Yang Chang、Nein-Chen Ciang
DOI:10.1002/jccs.199900005
日期:1999.2
AbstractA formal synthesis of (±)‐mitsugashiwalactone (1) and (±)‐isodihydro nepetalactone (2) was accomplished. Baeyer‐Villiger lactonization of ketone 9 followed by acidic treatment led to the rearranged lactone 8, which underwent a series of functional group transformations to give cyclopentanone derivatives 19 and 20. Shapiro reaction on 21 and 22 in the presence of excess dry ice gave lactones 5 and 6. Lactones 5 and 6 previously have been converted to mitsugashiwalactone (1) and isodihydronepetalactone (2), respectively.