Journal
ORGANIC LETTERS
Volume 2, Issue 17, Pages 2703-2705Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol006281x
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[GRAPHICS] 2-(Triisopropylsilyloxy)acrolein is easily prepared by the reaction of triisopropylsilyl triflate and 2-methoxy-2-methyl-[1,3]dioxan-5-one in the presence of triethylamine. This dienophile reacts with selected dienes in the presence of catalytic amounts of scandium triflate to afford products that are formally 4 + 3 cycloadducts. An exception is seen in the case of butadiene, where only a 4 + 2 cycloadduct is observed.
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