The first asymmetrichydrogenation of acyclic tetrasubstituted α,β-unsaturated amides has been achieved by usingRh/DuanPhos complex as a catalyst, delivering chiral β-amino amides with two contiguous chiral centers in excellent yields and high enantioselectivities (up to 99% yield, 96% ee), which provides efficient and concise access to valuable β-amino amide derivatives. The gram-scale reaction and
An Expeditious Synthesis of 6-Alkyl-5-(4′-amino-phenyl)-pyrimidine-2,4-diamines
作者:Daniel D. Holsworth、Michael Stier Jeremy、J. Edmunds、Wei He、Samuel Place、Samarendra Maiti
DOI:10.1081/scc-120024725
日期:2003.10
Abstract A rapid synthesis of a series of 6-alkyl substituted-5-(4′-amino-phenyl)-pyrimidine-2,4-diamines is described. These analogs were produced in good yields on moderate scale (ca. 8 g) without chromatography. Furthermore, the methodology described herein allows the production of 6-[ethyl, propyl, isopropyl, and isobutyl]-5-(4′-amino-phenyl)-pyrimidine-2,4-diamines in a more straightforward manner