Intramolecular inverse electron demand cycloadditions of isatin-derived 1,2,4-triazines with acetylenic dienophiles tethered by amidations or transesterifications proceed in excellent yields to produce lactam- or lactone-fused α-carbolines. Beginning with various isatins and alkynyl dienophiles, a pilot-scale library of eighty-eight α-carbolines was prepared by using this robust methodology for biological evaluation.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3388871 | PMC |
| http://dx.doi.org/10.3762/bjoc.8.93 | DOI Listing |
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