An Approach to Aminonaphthoquinone Ansamycins Using a Modified Danishefsky Diene
摘要:
A robust and scalable synthesis of a novel, cyano-substituted Danishefsky-type diene and its use in the Diels-Alder reaction with various dienophiles is reported. The diene allows for the rapid construction of highly substituted aminonaphthoquinones that occur in numerous ansamycin antibiotics.
The Synthesis of a Degradation Product of Phomazarin: A Regiospecific Elaboration of the B and C Rings of the Pigment
作者:Vincent Guay、Paul Brassard
DOI:10.1055/s-1987-27924
日期:——
An attempt to confirm the structure proposed for phomazarin has been initiated by the synthesis of one of its degradation products. The methods chosen also resulted in the regiospecific elaboration of the B and C rings of the pigment and are applicable to eventual syntheses by convergent approaches.
作者:Anastasia Hager、Christian A. Kuttruff、Elena Herrero-Gómez、Dirk Trauner
DOI:10.1016/j.tetlet.2013.10.104
日期:2014.1
Ansalactam A is a recently isolated ansamacrolide containing a spiro-γ-lactam functionality that is structurally distinct from other members of the ansamacrolide family. Herein, we describe synthetic studies toward ansalactam A. A route has been developed for the synthesis of a model system featuring a xanthate, which constitutes a direct precursor for the projected radical cyclization step aimed