A transgenic murine embryonic stem (ES) cell lineage expressing enhanced green fluorescent protein (EGFP) under the control of α-myosine heavy chain (α-MHC) promoter (pα-MHC-EGFP) was used to investigate the effects of (thio)urea and cinchona alkaloid derivatives on cardiomyogenesis. The screening of the compounds yielded cardiomyogenesis inducing substances with good (IV-5, V-4) to very good activities (II-16, IV-8), as determined by a 50 to 80 % increase in the EGFP fluorescence compared to untreated cells. Time-dependent screening approaches in which compounds were added at different developmental stages of the ES cells appeared to be of limited suitability for the identification of potential cellular targets.

A copper-catalyzed coupling reaction between flow-generated unstabilized diazo compounds and terminal alkynes provides di- and trisubstituted allenes. This extremely mild and rapid transformation is highly tolerant of several functional groups.