Stereogenic tert-alcohols via group-selective hydroalumination: further scope
摘要:
Two classes of bis-alkynyl alcohols were subjected to hydroalumination reaction, which, under suitable conditions, proceeded in a highly group-selective manner. (C) 2002 Elsevier Science Ltd. All rights reserved.
D-Erythronolactone as a C4 building unit. Part 2.1 A short and efficient synthesis of both enantiomers of epi-muricatacin, a diastereoisomer of the native acetogenin from Annona muricata
D-Erythronolactone as a C4 building unit. Part 2.1 A short and efficient synthesis of both enantiomers of epi-muricatacin, a diastereoisomer of the native acetogenin from Annona muricata
Both enantiomers of epi-muricatacin (+)- and
(-)-2 have been prepared from
2,3-O-isopropylidene-D-erythrose 7. The enantiomers (+)-
and (-)-2 are obtained in good yields and with high
diastereoisomeric and enantiomeric purity. The aim of the
synthesis is to obtain both enantiomers of the target molecule
from one chiral precursor. This was made possible by the reaction
sequence for the introduction of the two different side chains
being exchangeable.
Two classes of bis-alkynyl alcohols were subjected to hydroalumination reaction, which, under suitable conditions, proceeded in a highly group-selective manner. (C) 2002 Elsevier Science Ltd. All rights reserved.