No abstract

A new straightforward approach to 3-indolyl-derived cyclopenta [b]indoles by a Lewis acid triggered [3+2] cyclodimerization of 2-(3-indolyl)cyclopropane-1,1-dicarboxylic acid diesters was developed. This reaction exhibits exceptional chemo-, regio-, and diastereoselectivities, leading to the formation of an individual diastereomer with a relative configuration that corresponds to that of naturally occurring indole terpenoids.

An effective and highly regio- and diastereoselective one-pot synthesis of two type of dispiro heterocyclic systems (2-thioxodispiro[imidazolidine-4,3'-pyrrolidine-2',3''-indoline]-2'',5-diones and 2-thioxodispiro[imidazolidine-4,3'-pyrrolidine-4',3''-indoline]-2'',5-diones) comprising pyrrolidinyloxindole, thiohydantoin and adamantane moieties have been developed based on a 1,3-dipolar cycloaddition of azomethine ylides, generated from isatin and sarcosine or formaldehyde and sarcosine, to adamantine-containing electron-deficient alkenes. Several molecules have demonstrated a considerable cytotoxicity against and A549, HEK293T, MCF7 and VA13 cancer cell lines. The possible mechanism of anticancer activity of synthesised compounds based on literature data may be the inhibition of p53/MDM2 interaction, however, we did not observe significant p53 activation using a reporter construction in A549 cell line in a relevant concentration range.