General Reactivity of 2-Lithiobenzothiazole to Various Electrophiles and the Use as a Formyl Anion Equivalent in the Synthesis of α-Hydroxy Carbonyl Compounds
demonstrated by its reaction with phenacyl halides and 5-chloro-2-pentanone leading to the formation of benzothiazolyl-substituted small-ring ethers. In order to demonstrate the value of 2-lithiobenzothiazole as a masked formyl anion, 2-(α-hydroxyalkyl)benzothiazoles were transformed into α-hydroxy carbonyl compounds in three reaction steps without masking the α-hydroxygroups. Quaternization of various
High yield acyl anion transfer reactions: nucleophilic acylation of aldehydes
作者:Dietmar Seyferth、Robert M. Weinstein、Wei-Liang Wang、Richard C. Hui
DOI:10.1016/s0040-4039(01)99807-7
日期:1983.1
Aldehydes may be acylated to give R'CH(ON)C(O)R in good yield by the RLi/CO in situ procedure at very low temperatures. Examples are given of ketone acylations which demonstrate the advantages of 1:1 RLi/substrate stoichiometry and the use of lower (−135°C) temperature.
Synthesis of .alpha.-hydroxy ketones by direct, low-temperature, in situ nucleophilic acylation of aldehydes and ketones by acyllithium reagents
作者:Dietmar Seyferth、Robert M. Weinstein、Richard C. Hui、Wei Liang Wang、Colin M. Archer
DOI:10.1021/jo00047a014
日期:1992.10
The reaction of n-, sec-, and tert-butyllithium with CO at atmospheric pressure at -110 and -135-degrees-C in the appropriate solvent system in the presence of ketones and aldehydes generates the acyllithium, RC(O)Li, which reacts with the carbonyl compound to give the alpha-hydroxy ketone, generally in good yield. Reactions with aldehydes are limited in scope, working well with the t-BuLi-derived acyllithium reagents, but not with n-BuC(O)Li.
High-yield acyl anion trapping reactions: syntheses of .alpha.-hydroxy ketones and 1,2-diketones
作者:Dietmar Seyferth、Robert M. Weinstein、Wei Liang Wang
DOI:10.1021/jo00155a057
日期:1983.4
N-Substituted organo(silyliminomethyl)stannanes: synthetic equivalent to organosilylcarbonyl anion and carbonyl dianion