Synthesis of the 2-aza analogues of the pyrrolizidine alkaloid motif with two contiguous stereocenters has been achieved with high regio-, chemo-, and diastereoselectivity by an innovative multicomponent reaction in water. This elegant tactic has integrated the principles of privileged substructure-based Diversity Oriented Synthesis (pDOS) and Biology Oriented Synthesis (BIOS) to access a biologically relevant scaffold.
An oxindole decorated 4H-chromene scaffold has been synthesized in water under catalyst-free reaction conditions at ambient temperature by integrating the guiding principles of Diversity Oriented Synthesis (DOS) and green chemistry.
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