LABDANE DITERPENOID COMPOUNDS, SEMEN BIOTAE EXTRACT, AND PREPARATION METHOD AND USE THEREOF
申请人:Sun Yat-Sen University
公开号:EP2857391A1
公开(公告)日:2015-04-08
Provided in the present invention are various labdane diterpenoid compounds and derivatives thereof for use in preparation of a pharmaceutical composition for preventing or treating neurodegenerative diseases. Also provided in the present invention is a semen biotae extract comprising one or more labdane diterpenoid compounds and derivatives thereof for use in preparation of a pharmaceutical composition for preventing or treating neurodegenerative diseases.
Stereoselection in the Prins-Pinacol Synthesis of Acyltetrahydrofurans
作者:Frederick Cohen、David W. C. MacMillan、Larry E. Overman、Alex Romero
DOI:10.1021/ol0157003
日期:2001.4.1
Depending upon the nature of the alkene and allylic substituents, acid-promoted rearrangements of acetals derived from anti allylic diols give 12 or stereoisomeric acyltetrahydrofurans 13. Stereoelectronic effects of the allylic substituents and the extent of bonding in the Prins cyclization transition state are central features of a proposed new model for predicting stereoselection in the Prins-pinacol synthesis of acyltetrahydrofurans.
HOPKINS, MARK H.;OVERMAN, LARRY E.;RISHTON, GILBERT M., J. AMER. CHEM. SOC., 113,(1991) N4, C. 5354-5365
作者:HOPKINS, MARK H.、OVERMAN, LARRY E.、RISHTON, GILBERT M.
DOI:——
日期:——
Stereocontrolled preparation of tetrahydrofurans from acid-promoted rearrangements of allylic acetals
作者:Mark H. Hopkins、Larry E. Overman、Gilbert M. Rishton
DOI:10.1021/ja00014a030
日期:1991.7
tetrahydrofurans from readily available allylic diol and carbonyl components is reported. This synthesis is highly stereocontrolled and allows carbon side chains to be incorporated at each carbon. Enantiomerically pure tetrahydrofurans are readily prepared from chiral, nonracemic allylic diol precursors. The asymmetric synthesis of (+)-muscarine tosylate from the lactate-derived allylic diol 6a demonstrates that