26978-16-5Relevant articles and documents
Rapid, One-Step Synthesis of α-Ketoacetals via Electrophilic Etherification
Paris, Timothy J.,Schwartz, Chris,Sundall, Eric,Willand-Charnley, Rachel
, p. 14797 - 14811 (2021/10/20)
Herein, we report a rapid, one-step synthesis of α-ketoacetals via electrophilic etherification of α-alkoxy enolates and monoperoxyacetals. Methyl, primary, and secondary α-ketoacetals were obtained in 44-63% yields from tetrahydropyranyl substrates; usin
Selectivity in Lewis acid-mediated fragmentations of peroxides and ozonides: Application to the synthesis of alkenes, homoallyl ethers, and 1,2-dioxolanes
Dussault, Patrick H.,Lee, Hyung-Jae,Liu, Xuejun
, p. 3006 - 3013 (2007/10/03)
Fragmentation of dialkyl peroxides and ozonides is strongly influenced by the choice of Lewis acid. TiCl4 promotes C-O ionization (SN1 reaction) of tertiary peroxides while SnCl4 and BF3·OEt2 promote O-O heterolysis (Hock reaction). The cationic intermediates are trapped with allyltrimethylsilane to afford allylated alkanes and homoallyl ethers. In the absence of a nucleophile, ozonides (1,2,4-trioxolanes) invariably undergo O-O heterolysis. However, the combination of allyltrimethylsilane and SnCl4 results in formation of 1,2-dioxolanes via trapping of intermediates derived from SN1 ionization.