Substitution- and Elimination-Free Phosphorylation of Functionalized Alcohols Catalyzed by Oxidomolybdenum Tetrachloride
作者:Cheng-Yuan Liu、Vijay D. Pawar、Jun-Qi Kao、Chien-Tien Chen
DOI:10.1002/adsc.200900279
日期:2010.1.4
the tested alcohols, oxidomolybdenum tetrachloride (MoOCl4) was found to be the most efficient with a negligible background reaction mediated by triethylamine (Et3N). The new catalytic protocol can be applied to the chemoselective phosphorylations of primary, secondary and tertiary alcohols as well as the substitution‐free phosphorylations of allylic, propargylic, and benzylic alcohols. Functionalized
Substitution of diethyl and diphenyl benzylic phosphates, Alk-CH(Ar1)OP(O)(OR)2 (R = Et, Ph; Alk = Me, Et, i-Pr; Ar1 = aryl), with the anions derived from Ar2CH2 (Ph2CH2,9H-xanthene and fluorene) and n-BuLi at –15 °C was studied. For phosphates with Me as an Alk, diethyl phosphates produced Me-CH(Ar1)CH(Ar2)2 (Ar1 = 4-halo-, 4-CN, 4-Me-, 2-Me, 2-Br-, 3-MeO-phenyl and 2-naphthyl). However, an unwanted
Design, synthesis, application and recovery of a minimally fluorous diaryl diselenide for the catalysis of stannane-mediated radical chain reactions
作者:David Crich、Xiaolin Hao、Mathew Lucas
DOI:10.1016/s0040-4020(99)00902-3
日期:1999.12
diselenide is described. On reduction in situ with tributylstannane this diselenide provides a fluorous selenol which is effective in inhibiting a range of stannane-mediated radicalrearrangements, including a cyclopropylcarbinyl ring opening. A method for the recovery of the fluorous diselenide involving continuous extraction in a modified, cooled continuous extractor is described.
Catalytic phosphorylation using a bifunctional imidazole derived nucleophilic catalyst
作者:Simon Jones、Julian Northen、Alan Rolfe
DOI:10.1039/b506344b
日期:——
A bifunctional catalyst containing a polyether backbone and a nucleophilic imidazole moiety has been prepared that demonstrates cooperative catalysis in the presence of added group 1 and 2 salts for the phosphorylation of alcohols.
The β-(Phosphatoxy)alkyl Radical Rearrangement. Rate Constants, Arrhenius Parameters, and Structure Activity Relationships
作者:David Crich、Xian-Yun Jiao
DOI:10.1021/ja961275a
日期:1996.1.1
Rateconstants for the migration of a series of p,p-disubstituted β-(diarylphosphatoxy)alkyl migrations have been determined in benzene at reflux by competition against the benzeneselenol clock reaction. There is a strong linear correlation of log(k) with the Hammett σp but not with various σ• parameters indicating that the migration occurs through a highly polarized transition state resembling an