Sequential Reactions of Trimethylsilyldiazomethane with 4‑Alkenyl Ketones and Aldehydes Catalyzed by Lewis Bases
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A sequence of a carbonyl addition between 4-alkenyl ketones and aldehydes with trimethylsilyldiazomethane followed by a 1,3-Brook rearrangement and an intramolecular 1,3-dipolar cycloaddition was promoted by Lewis bases tetrabutylammonium triphenyldifluorosilicate (TBAT) or potassium tert-butoxide (KO-t-Bu). Through these concatenated bond-forming processes, a variety of novel bi- and tricyclic Δ1-pyrazolines were synthesized.
创建时间：
2016-02-19
