Syntheses of Enantiopure 1,2-Ethylenediamines with Tethered Secondary Amines of the Formula H2NCH2CH[(CH2)
n
NHMe]NH2 (n = 1–4) from α-Amino Acids: New Agents for Asymmetric Catalysis
作者:John A. Gladysz、Connor Q. Kabes、Jack H. Gunn、Maximilian A. Selbst、Reagan F. Lucas
DOI:10.1055/s-0040-1707146
日期:2020.11
adducts of the title compounds are prepared from the inexpensive α-amino acids H2N(C=O)CH2CH(NH2)CO2H, HO(C=O)(CH2) n′CH(NH2)CO2H (n′ = 1, 2), and H2N(CH2)4CH(NH2)CO2H, respectively (steps/overall yield = 5/32%, 7/30%, 7/33%, 5/38%). The NH2 group that is remote from the secondary amine is installed via BH3 reduction of an amide [–(C=O)NR2] derived from an α-amino carboxylic acid. The MeNHCH2 units are
作为特别主题的一部分发表,酰胺键形成的最新进展 抽象 三(盐酸盐)的标题化合物的加合物是从廉价的制备α-氨基酸ħ 2 N(C = O)CH 2 CH(NH 2)CO 2 H,HO(C = O)(CH 2)ñ “ CH (NH 2)CO 2 H(n '= 1,2)和H 2 N(CH 2)4 CH(NH 2)CO 2 H(步数/总收率= 5/32%,7/30% ,7/33%,5/38%)。通过BH 3还原酰胺[–(C = O)NR 2来安装远离仲胺的NH 2基团 由α-氨基羧酸衍生的]。通过BH 3还原氨基甲酸烷基酯[RO(C = O)NHCH 2 –来引入MeNHCH 2单元。R = Et,t -Bu]或酰胺[MeHN(C = O)–]部分。