Diastereoselection in the LiA1H4 reduction of severely hindered β-diketones examples of -curtin-hammett preequilibrium conditions
摘要:
LiAlH4 Reduction of alpha-adamantyl (and tert-butyl)-beta-diketones occur under anti-Curtin-Hammett preequilibrium conditions, each preferred conformer leading to a different stereoisomeric diol, whereas reduction of 3-adamantyl-3-methyl (and ethyl)pentane-2,4-dione occurs with high diastereoselectivity to afford only the (2R, 3r, 4S) meso diol.
Alxylations of α-methyl substituted β-diketones throught their Cu(II) complexes. Preparation of sterically congested β-diketones.
作者:María E. Lloris、Jorge Marquet、Marcial Moreno-Mañas
DOI:10.1016/s0040-4039(00)88524-x
日期:1990.1
The copper(II) complexes of 3-methylpentane-2,4-dione and 2-methyl-1-phenylbutane-1,3-dione are good substrates for C-alkylation with several alkyl bromides including 1-bromoadamantane and 9-bromofluorene. Sterically congested β-diketones have been prepared.