Construction of highly functionalized diazoacetoacetates via catalytic Mukaiyama-Michael reactions.
Functionalized diazo acetoacetates are prepared by an efficient Mukaiyama-Michael reaction between methyl 3-(trialkylsilanoxy)-2-diazo-3-butenoate and alpha,beta-unsaturated enones. Vinyl ether and ketone derivatives are both accessible in good to excellent yield through this methodology. The mild Lewis acid zinc(II) triflate is the optimal catalyst, and its loading can be as low as 0.1 mol %. In addition, zinc triflate was also found to be a superior catalyst for the related Mukaiyama-aldol reaction.
Liu
Yu
Y
Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
Zhang
Yu
Y
Jee
Noel
N
Doyle
Michael P
MP
D000085:Acetates / Q000737:chemistry*; D002384:Catalysis
D000085:Acetates