602275-66-1Relevant academic research and scientific papers
Oxazinanones as chiral auxiliaries: Synthesis and evaluation in enolate alkylations and aldol reactions
Davies, Stephen G.,Garner, A. Christopher,Roberts, Paul M.,Smith, Andrew D.,Sweet, Miles J.,Thomson, James E.
, p. 2753 - 2768 (2008/02/10)
Homochiral β-amino esters (prepared on multigram scale by lithium amide conjugate addition) are readily transformed into oxazinanones. N-Acyl derivatives of oxazinanones undergo stereoselective enolate alkylation reactions, with higher stereoselectivities observed for the enolate alkylation of (R)-N-propanoyl-4-iso-propyl-6,6-dimethyl-oxazinan-2-one than the corresponding Evans oxazolidin-2-one. A C(4)-iso-propyl stereodirecting group within the oxazinanone conveys higher stereoselectivity than the analogous C(4)-phenyl substituent. gem-Dimethyl substitution at C(6) within the oxazinanone framework facilitates exclusive exocyclic cleavage upon hydrolysis to furnish α-substituted carboxylic acid derivatives and the parent oxazinanone in good yield. Asymmetric aldol reactions of a range of aromatic and aliphatic aldehydes with the chlorotitanium enolate of (R)-N-propanoyl-4-iso- propyl-6,6-dimethyl-oxazinan-2-one proceed with excellent diastereoselectivity. Hydrolysis of the aldol products affords homochiral α-methyl-β- hydroxy-carboxylic acids. The Royal Society of Chemistry 2006.
A facile enantioselective synthesis of 2-(2-aminoethyl)allylsilanes, new synthons for piperidine synthesis
Monfray, Jérémy,Gelas-Mialhe, Yvonne,Gramain, Jean-Claude,Remuson, Roland
, p. 5785 - 5787 (2007/10/03)
The synthesis of chiral (2-substituted-2-aminoethyl)allylsilanes by cerium mediated trimethylsilylmethylmagnesium chloride addition to the ester group of non racemic chiral β-aminoesters is described.
