Iodomethylation of Chiral α-Amino Aldehydes by Means of Samarium/Diiodomethane. Application to the Synthesis of Various Enantiomerically Pure Compounds
作者:José M. Concellón、Pablo L. Bernad、Juan A. Pérez-Andrés
DOI:10.1021/jo970318i
日期:1997.12.1
Chiral iodohydrins 2 have been obtained from alpha-amino aldehydes 1 and Sm/CH2I2. Treatment of compound 2 with acetic anhydride, NaH, or AgBF4 affords, with high diastereoselectivity, O-protected 3-(dibenzylamino)-1-iodoalkan-2-ol 3, amino epoxides 4, or azetidinium salts 5, respectively. The synthesis of enantiomerically pure allylamines 6 is also described by metallation of 3 with zinc. The reaction of a-amino aldehydes 1 with Sm/CH2I2 and further treatment with organocuprates affords chiral amino alcohols 7 in a one-pot process.
Synthesis of Enantiopure (α<i>S</i>,β<i>S</i>)- or (α<i>R</i>,β<i>S</i>)-β-Amino Alcohols by Complete Regioselective Opening of Aminoepoxides by Organolithium Reagents LiAlH<sub>4</sub> or LiAlD<sub>4</sub>
作者:José M. Concellón、Pablo L. Bernad、Virginia del Solar、José Ramón Suárez、Santiago García-Granda、M. Rosario Díaz
DOI:10.1021/jo0606756
日期:2006.8.1
reaction of chiral (2R,1‘S)- or (2S,1‘S)-2-(1-aminoalkyl)epoxides, 1 or 2 with a variety of organolithium compounds to obtain the corresponding (αS,βS)- or (αR,βS)- β-amino alcohols in enantiopure form is reported. In both cases, the opening of the oxirane ring at C-3 proceeded with total regioselectivity. Moreover, the ring opening of aminoepoxides 1 or 2 by hydride (utilizing LiAlH4) to obtain the corresponding