A straightforward procedure for the synthesis of enantiopure polysubstituted piperidines is reported. It involves the direct generation of chiral non-racemic oxazolo[3,2-a]piperidone lactams that already incorporate carbon substituents on the heterocyclic ring and the subsequent removal of the chiralauxiliary. The key step is a cyclocondensation reaction of (R)-phenylglycinol or other amino alcohols
racemic aryl-delta-oxoacids with (R)-phenylglycinol stereoselectively affords chiral non-racemic bicyclic lactams, from which the enantiodivergent synthesis of (R)- and (S)-2-phenylpiperidine, the diastereodivergent synthesis of cis- and trans-3-ethyl-2-phenylpiperidine, and the enantioselectivesynthesis of the piperidine alkaloid (-)-anabasine is reported.
Sen, P. K.; Lahiri, Sikha; Das, Tapan K., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1984, vol. <B> 23, # 9, p. 821 - 824
作者:Sen, P. K.、Lahiri, Sikha、Das, Tapan K.
DOI:——
日期:——
Kost; Terent'ew, Zhurnal Obshchei Khimii, 1956, vol. 26, p. 1992; engl. Ausg. S. 2219
作者:Kost、Terent'ew
DOI:——
日期:——
PERUMAL, THIRUMALAI P., SYNTH. COMMUN., 20,(1990) N, C. 1353-1356