New method for generation of β-oxido carbenoid via ligand exchange reaction of sulfoxides: A versatile procedure for one-carbon homologation of carbonyl compounds
one-carbon homologation of carbonylcompounds is described. The method is based on the rearrangement of β-oxido carbenoid which is generated via the ligand exchange reaction of the sulfinyl group of α-chloro β-hydroxy sulfoxide with tert-butyllithium. Addition of the carbanion of aryl 1-chloroalkyl sulfoxides to carbonylcompounds gave the adducts in good yields. The β-oxido carbenoid rearrangement of the
A novel method for generation of carbenoid from α-chloro sulfoxides: A new and versatile procedure for one-carbon homologation of carbonyl compounds to carbonyl compounds having an α-alkyl substituent
Addition of the carbanion of 1-chloroalkyl p-tolyl sulfoxides to carbonylcompound gave the adducts, which were treated with a base followed by t-butyllithium to afford one-carbon homologated carbonylcompounds having an alkyl group at the α-position, via the β-oxido carbenoids, in moderate to good yields.
Selective Homologation of Ketones and Aldehydes with Diazoalkanes Promoted by Organoaluminum Reagents
作者:Keiji Maruoka、Amel B. Concepcion、Hisashi Yamamoto
DOI:10.1055/s-1994-25682
日期:——
Organoaluminum-promoted single homologation or ring expansion of ketones and aldehydes with diazoalkanes has been described, and among various organoaluminum reagents, exceptionally bulky methylaluminum bis(2,6-di-tert-butyl-4-methylphenoxide) (MAD) is found to be highly effective for the selective homologation of various ketones and aldehydes.
Exploratory study on α-metallo selenones: original syntheses of oxaspiropentanes
作者:A. Krief、W. Dumont、J.L. Laboureur
DOI:10.1016/0040-4039(88)85138-4
日期:1988.1
Oxaspiropentanes have been obtained from α-metallocyclopropyl phenyl selenones and carbonyl compounds and on reaction of a base with β-hydroxyalkyl cyclopropyl selenones. The original reactivity of other β-hydroxyalkyl selenones is also disclosed.