Di-p-nitrobenzyl azodicarboxylate is prepared in 83.6% yield in two steps as a bright yellow solid, which can be used as an azo-reagent in the Mitsunobureaction. When a chiral secondary alcohol was used, sufficient configurational inversion of alcohol occurred under Mitsunobu conditions. That the hydrazine produced from DNAD is semisoluble in some solvents such as THF and CH2Cl2 makes it separated
Meldrum's acid can be reductively alkylated with borane⋯dimethylamine complex and aldehydes or ketones; borane⋯trimethylamine was used with cyclohexanone.
Copper-catalyzed conjugate addition of grignard reagents to isopropylidene alkylidenemalonates
作者:Xian Huang、Cheng-Chu Chan、Qian-Li Wu
DOI:10.1016/s0040-4039(00)97536-1
日期:1982.1
A new method for the synthesis of isopropylidene alkylmalonates involving conjugateaddition of Grignardreagents to isopropylidene alkylidenemalonates was developed.