Synthetic Applications of Pd(II)-Catalyzed C−H Carboxylation and Mechanistic Insights: Expedient Routes to Anthranilic Acids, Oxazolinones, and Quinazolinones
作者:Ramesh Giri、Jonathan K. Lam、Jin-Quan Yu
DOI:10.1021/ja9077705
日期:2010.1.20
carbon monoxide is discussed. Identification of two key intermediates, a mixed anhydride and benzoxazinone formed by reductive elimination from organometallic Ar(CO)Pd(II)-OTs species, provides mechanistic evidence for a dual-reaction pathway.
Quinazoline Antifolate Thymidylate Synthase Inhibitors: Replacement of Glutamic Acid in the C2-Methyl Series
作者:Peter R. Marsham、Ann L. Jackman、Andrew J. Barker、F. Thomas Boyle、Stephen J. Pegg、J. Michael Wardleworth、Rosemary Kimbell、Brigid M. O'Connor、A. Hilary Calvert、Leslie R Hughes
DOI:10.1021/jm00006a019
日期:1995.3
the appropriate amino acid or amino acidester. In cases where the amino acidester was unreactive with the acid azide, a modification was used in which the quinazolinone moiety was protected as its 3-(pivaloyloxy)methyl derivative. This permitted the generation of the more reactive acid chloride of the p-aminobenzoate unit. In general these modifications result in compounds that have equivalent potency
The present invention provides a process for preparing a 5,6-dihydro-3H-pyrimidin-4-one derivatives which comprises the steps of (a) dehydrating a N-acyl beta amino acid in the presence of a dehydration agent and an organic solvent for a sufficient period of time and under suitable temperature and pressure conditions to form an oxazone (b) adding a carboxylic acid and a primary amine salt of a carboxylic acid to said oxazone to form a mixture, (c) distilling azeotropically said mixture for a suitable period of time and under suitable temperature and pressure conditions to substantially remove said dehydration agent and said organic solvent, and (d) heating the product of step (c) for a sufficient period of time and under suitable temperature and pressure conditions to form said pyrimidin derivatives.