Diastereoselective Electrophilic Amination of Chiral 1-Benzoyl-2,3,5,6-tetrahydro-3-methyl-2-(1-methylethyl)pyrimidin-4(1H)-one for the Asymmetric Syntheses ofα-Substitutedα,β-Diaminopropanoic Acids
作者:Elena Castellanos、Gloria Reyes-Rangel、Eusebio Juaristi
DOI:10.1002/hlca.200490073
日期:2004.4
The chiral compounds (R)- and (S)-1-benzoyl-2,3,5,6-tetrahydro-3-methyl-2-(1-methylethyl)pyrimidin-4(1H)-one ((R)- and (S)-1), derived from (R)- and (S)-asparagine, respectively, were used as convenient starting materials for the preparation of the enantiomerically pure α-alkylated (alkyl=Me, Et, Bn) α,β-diamino acids (R)- and (S)-11–13. The chiral lithium enolates of (R)- and (S)-1 were first alkylated
手性化合物(R)-和(S)-1-苯甲酰基-2,3,5,6-四氢-3-甲基-2-(1-甲基乙基)嘧啶-4(1 H)-一((R) -和(小号) - 1),从(衍生ř) -和(小号)天冬酰胺,分别用作方便的起始原料为对映体纯的制备α烷基化(烷基=甲基,乙基,BN)α,β -二氨基羧酸([R )-和(小号) - 11 - 13。(R)-和(S)-1的手性锂烯酸酯首先烷基化,将得到的非对映异构产物5 - 7进行胺化以“二(叔丁基)偶氮二羧酸”(DBAD),从而产生了非对映异构纯的(≥98%)化合物8 - 10。目标化合物([R )-和(小号) - 11 - 13然后可以以良好的收率和高纯度通过水解/氢解/水解序列来获得。