1,3-Diphenylpropan-1,3-diamines IX. reaction of ?-chlorooxime ethers with ?-lithiobenzylamines
摘要:
The carbanions of the benzylamine derivatives 1-4 have been reacted with alpha-chlorooxime ether 5 in order to gel precursors of 1,3-diphenylpropane-1,3-diamines. Isonitrile 1 afforded the expected result, whereas lithiated benzamide 2 underwent oxidative dimerization and transmetallated chlorooxime derivative 5. Isoxazolidine 3 gave the condensation product 21 as a mixture of diastereomers; treatment of imine 4 led to the desired amine-oxime 15 in low yield.
Enantioselective addition of diethylzinc to aldehydes with novel chiral C2-symmetric dimeric ligands
作者:Masanori Okaniwa、Reiko Yanada、Toshiro Ibuka
DOI:10.1016/s0040-4039(99)02230-3
日期:2000.2
Novel (S)-valinol-based chiral C2-2,2′-ethylenediiminodiethanol derivatives 4a and 4b have been synthesized and used as chiral catalysts in the enantioselectiveaddition of diethylzinc to aldehydes. (R)-1-Phenylpropanol has been obtained in up to 91% enantiomeric excess.