A Convenient Method for the Synthesis of Dialkyl Ethers by Alkylation of Alcohols Using Phosphinimidates in the Presence of a Catalytic Amount of Trimethylsilyl Triflate
作者:Hidenori Aoki、Teruaki Mukaiyama
DOI:10.1246/bcsj.79.1255
日期:2006.8
An alkylation reaction of alcohols with alkyl N-(methylsulfonyl)diphenylphosphinimidates proceeded smoothly in the presence of a catalytic amount of trimethylsilyl triflate (Me3SiOTf) in DME at roo...
Cyanation of various alcohols by a new type of oxidation–reduction condensation is described. Primary alkyl diphenylphosphinites, 2,6-dimethyl-1,4-benzoquinone (DMBQ), and diethyl cyanophosphonate ...
Stereospecific C–S Bond Formation from Chiral Tertiary Alcohols by Quinone-Mediated Oxidation–Reduction Condensation Using Alkyl Diphenylphosphinites and Its Application to the Synthesis of a Chiral Tertiary Thiol
Oxidation–reduction condensation between 2-sulfanyl-1,3-benzothiazole (Btz-SH) and the alkyl diphenylphosphinites 1, prepared from tertiary alcohols, proceeded smoothly in the presence of 2,6-di-t-...
A convenient two-step procedure for the construction of sulfur-containing quaternary centers from tert-alcohols involving chiral ones is established. tert-Alkyl diphenylphosphinites 1 were easily prepared in excellent yields from tert-alcohols and ClPPh2 by the combined use of Et3N and a catalytic amount of DMAP. Subsequent condensation of 1 with thiol 3 smoothly proceeded in the presence of quinone 2d to afford the corresponding tert-alkyl sulfides 4 in good to high yields via SN2 displacement. Removal of benzothiazol-2-yl group of (R)-4j was achieved with LiAlH4 to afford the desired chiral thiol (R)-5 in high yield.
N-Alkylation of Phthalimide, Carboxamide, and Sulfonamides By Oxdation–Reduction Condensation Using Di-<i>tert</i>-butyl-1,4-benzoquinone and Alkyl Diphenylphosphinite
作者:Teruaki Mukaiyama、Hidenori Aoki
DOI:10.1246/cl.2005.142
日期:2005.2
Various N-alkylamides were obtained in high yields under mild conditions by treating alkyl diphenylphosphinite with phthalimide, carboxamide or sulfonamides in the presence of 2,6-di-tert-butyl-1,4-benzoquinone (DBBQ) by oxdation–reduction condensation.