A useful synthetic equivalent of an acetone enolate
作者:Veselin Maslak、Zorana Tokic-Vujosevic、Zorana Ferjancic、Radomir N. Saicic
DOI:10.1016/j.tetlet.2009.09.113
日期:2009.12
2-Methoxymethoxy-3-chloropropene derived organometallics act as synthetic equivalents of an acetone enolate. Indium-promoted reaction of this reagent with aldehydes affords aldol adducts in moderate to excellent yields. When the reaction was performed with zinc, aldol products were isolated in protected form as the corresponding MOM-enol ethers. (C) 2009 Elsevier Ltd. All rights reserved.
Stereodivergent Catalytic Doubly Diastereoselective Nitroaldol Reactions Using Heterobimetallic Complexes
Stereodivergent construction of three contiguous stereocenters in catalytic doubly diastereoselective nitroaldol reactions of a-chiral aldehydes with nitroacetaldehyde dimethyl acetal using two types of heterobimetallic catalysts is described. A La-Li-BINOL (LLB) catalyst afforded anti,syn-nitroaldol products in >20:1-14:1 selectivity, and a Pd/La/Schiff base catalyst afforded complimentary syn,syn-nitroaldol products in 10:1-5:1 selectivity.