The preparation of a steroidal heterocycle linked to the tripeptide Cys-Gly-Cys is described. Initially, an estrane-derived steroidal heterocycle containing an aminopyrimidine ring fused to the 16,17-position of the steroidal nucleus was synthesized. Thereafter, protected amino acids were coupled iteratively by the DCC method, commencing at the amino group of the aminopyrimidine unit.
Efficient Synthesis of 4- and 5-Substituted 2-Aminopyrimidines by Coupling of β-Chlorovinyl Aldehydes and Guanidines
作者:Anna S. Komendantova、Alexander V. Komkov、Yulia A. Volkova、Igor V. Zavarzin
DOI:10.1002/ejoc.201700737
日期:2017.8.10
A general, practical and simple synthesis of functionalized 2-aminopyrimidines starting from β-chlorovinyl aldehydes and amidines is reported. In the presence of potassium carbonate, various ketones have been efficiently incorporated into the pyrimidine derivatives by two-step sequence involving the Vilsmeier-Haack reaction followed by the condensation with guanidines. The protocol is distinguished