186891-49-6Relevant academic research and scientific papers
An efficient approach to 2-substituted N-tosylpiperdines: asymmetric synthesis of 2-(2-hydroxy substituted)piperidine alkaloids
Bisai, Alakesh,Singh, Vinod K.
, p. 1907 - 1910 (2007/10/03)
We have developed an efficient and a general approach to chiral 2-substituted N-tosylpiperidines starting from chiral α-substituted-N-tosylaziridines. Using this approach, we have synthesized (+)-coniine. The synthesis of chiral N-tosyl-2-piperidinylethanol 15 and ent-15, was achieved from l- and d-aspartic acids, respectively in few steps. Piperidine 15 was converted into 2-(2-hydroxysubstituted)piperidines of type 2 in optically active form. By applying this strategy, asymmetric syntheses of halosaline (R,R)-2a, (+)- and (-)-sedamine 2b, (+)- and (-)-allosedamine 2c, (+)- and (-)-sedridine 2d, (+)- and (-)-allosedridine 2e, (+)-tetraponerine T-3 3a, T-4 3c, T-7 3b, and T-8 3d have been achieved in high yields. These stereoisomers can be interconverted via Mitsunobu inversion in excellent yields.
N-sulfinyl beta-amino Weinreb amides: synthesis of enantiopure beta-amino carbonyl compounds. Asymmetric synthesis of (+)-sedridine and (-)-allosedridine.
Davis, Franklin A,Prasad, Kavirayani R,Nolt, M Brad,Wu, Yongzhong
, p. 925 - 927 (2007/10/03)
[reaction: see text] N-Sulfinyl beta-amino Weinreb amides are prepared by condensation of sulfinimines with the potassium enolate of N-methoxy-N-methylacetamide. These new chiral building blocks are useful for the asymmetric synthesis of beta-amino carbon
Heterocyclisation via 1,3-Cyclic Sulfates. Asymmetric Synthesis of (+)-Sedridine
Littler, Benjamin J.,Gallagher, Timothy,Boddy, Ian K.,Riordan, Peter D.
, p. 22 - 24 (2007/10/03)
1,3-Cyclic sulfates (1b-d) participate in heterocyclisation reactions to give pyrrolidines (2b) and piperidines (2c/d). Cyclic sulfate activation, when coupled to the enantio- and diastereoselective generation of 1,3-diols, provides a synthesis of (+)-sedridine (9).
