Synthesis of optically active .beta.,.gamma.-epoxy alcohols and secondary allylic alcohols via diastereoselective addition of .alpha.-(trimethylsilyl)-.alpha.,.beta.-epoxy aldehydes with organometallic compounds
Synthesis of optically active .beta.,.gamma.-epoxy alcohols and secondary allylic alcohols via diastereoselective addition of .alpha.-(trimethylsilyl)-.alpha.,.beta.-epoxy aldehydes with organometallic compounds
On the palladium(II)-catalyzed rearrangement of allyl imidates
作者:Peter Metz、Cornelia Mues、Andreas Schoop
DOI:10.1016/s0040-4020(01)88203-x
日期:1992.1
Polyhetero-[3,3]-sigmatropic rearrangements of allyl N-phenylimidates 4a - ▾ catalyzed by dichlorobis- (benzonitrile)palladium(II) are shown to afford N-allyl-N-phenylamides in good to excellent yields for substitution patterns that have so far precluded cyclization-induced allyl shifts. Using trichloroacetimidates of secondary allyl alcohols as substrates, the palladium(II)-catalyst effects a completely (E)
Diastereoselective addition of lower order vinylcuprates to (R)-2,3-O-Isopropylideneglyceraldehyde
作者:Peter Metz、Andreas Schoop
DOI:10.1016/s0040-4020(01)81551-9
日期:1993.1
Highly syn or anti selective addition of lower order lithium vinylcuprates generated from alkenyl bromides 1 to (R)-2,3-O-isopropylideneglyceraldehyde (2) can be achieved, respectively, depending on the substitution pattern of the vinyl moiety and the solvent. Alpha-Trimethylsilyl substituted vinylcuprates possessing an alkyl substituent Z to copper react with excellent syn selectivity in ether whereas a highly anti selective addition is observed for cuprates bearing a hydrogen atom Z or alpha to the metal in THF. A model is proposed to rationalize these complementary selectivities.
CATO, FUMIEH
作者:CATO, FUMIEH
DOI:——
日期:——
TAKEDA YOSHIYUKI; MATSUMOTO TAKASHI; SATO FUMIE, J. ORG. CHEM., 51,(1986) N 24, 4728-4731
作者:TAKEDA YOSHIYUKI、 MATSUMOTO TAKASHI、 SATO FUMIE