1009606-69-2Relevant academic research and scientific papers
Stereoselective access to fluorinated and non-fluorinated quaternary piperidines: Synthesis of pipecolic acid and iminosugar derivatives
Fustero, Santos,Albert, Laia,Mateu, Natalia,Chiva, Gema,Miro, Javier,Gonzalez, Javier,Acena, Jose Luis
scheme or table, p. 3753 - 3764 (2012/05/19)
The preparation of optically pure quaternary piperidines, both fluorinated and non-fluorinated, has been achieved from a chiral imino lactone derived from (R)-phenylglycinol. In the case of the fluorinated derivatives, the addition of (trifluoromethyl)trimethylsilane (TMSCF3) followed by iodoamination and migration of the CF3 group allowed access to four derivatives of α-(trifluoromethyl)pipecolic acid. A theoretical study of the CF 3-group rearrangement has been carried out to help establish the reaction mechanism of this uncommon transformation. Moreover, a route to trifluoromethyl-substituted iminosugars was also developed through the diastereoselective dihydroxylation of suitable synthetic intermediates. Conversely, alkylation of the starting substrate and subsequent cross-metathesis and aza-Michael reactions led to α-alkyl derivatives of the target compounds. Copyright
An efficient entry to optically active anti- and syn-β-amino-α- trifluoromethyl alcohols
Fustero, Santos,Albert, Laia,Acena, Jose Luis,Sanz-Cervera, Juan F.,Asensio, Amparo
, p. 605 - 608 (2008/09/16)
The reaction of chiral 5,6-dihydro-2H-1,4-oxazin-2-ones with TMSCF 3 in the presence of a suitable activator leads to trifluoromethyl lactols, which can be selectively reduced to anti-β-amino-α- trifluoromethyl alcohols. The corresponding syn d
