Enantioselective addition of (Z)- and (E)-alkenylzinc bromides to aldehydes: asymmetric synthesis of sec-allylalcohols
作者:Wolfgang Oppolzer、Rumen N. Radinov
DOI:10.1016/s0040-4039(00)93553-6
日期:1991.10
In situ prepared (Z)- and (E)-1-alkenylzinc bromides 5 were added to various aldehydes 1 in the presence of lithiated (+)-N-methylephedrine or (+)-2-(N,N-dimethylamino)-1,2-diphenylethanol to give sec. allyalcohols 7 in high optical purity with simple recovery of the chiral aminol 6.
Total Synthesis of the Alkoxydioxines (+)- and (−)-Chondrillin and (+)- and (−)-Plakorin via Singlet Oxygenation/Radical Rearrangement
作者:Patrick H. Dussault、C. Todd Eary、Kevin R. Woller
DOI:10.1021/jo981128q
日期:1999.3.1
unaffected by the presence of polar co-solvents or by the incorporation of a group able to selectively hydrogen bond to the product hydroperoxide. Photoisomerization of the (E)-4-hydroperoxy-2-enone rearrangement products results in irreversible ring closure to furnish diastereomeric mixtures of enantiomericallyenriched dioxinols. The strategy is applied to the total synthesis of the alkoxydioxine natural