Novel One-pot Three-component Coupling Reaction with Trimethylsilylmethyl-phosphonate, Acyl Fluoride, and Aldehyde through the Horner–Wadsworth–Emmons Reaction
作者:Taiki Umezawa、Tomoya Seino、Fuyuhiko Matsuda
DOI:10.1021/ol301879a
日期:2012.8.17
A novelthree-component coupling between trimethylsilylmethylphosphonate, acyl fluoride, and aldehyde has been developed. A sequential nucleophilic addition of lithio-trimethylsilylmethylphosphonate to the acyl fluoride and Horner–Wadsworth–Emmons reaction of an aldehyde with the lithio-β-ketophosphonate generated in situ by desilylation at the α-position of the α-silyl-β-ketophosphonate by fluoride
practical nickel-catalyzed deaminative alkylation of Katritzky salts with cyclopropyl alcohols via merging C–N and C–C bond activation. This protocol enables the formation of an alkyl–alkyl bond along with the generation of a versatile ketone functional group in a single operation, thus providing a convenient approach for accessing β-alkyl ketones. This reaction is distinguished by its high functional
Borsche; Wollemann, Chemische Berichte, 1912, vol. 45, p. 3717
作者:Borsche、Wollemann
DOI:——
日期:——
Synthesis of diarylheptanoids and assessment of their pungency.
作者:HIDEJI ITOKAWA、RITSUO AIYAMA、AKIRA IKUTA
DOI:10.1248/cpb.31.2491
日期:——
With the aim of correlating pungency with substituent groups on one benzene ring, various analogues of yakuchinones were synthesized by means of the Claisen-Schmidt reaction. Their pungencies were assessed by direct comparison of the threshold concentrations obtained in taste experiments. The presence of a phenolic hydroxyl group was indispensable for high pungency, while that of a 1, 2-double bond of the heptanone part tended to decrease the pungency.