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| Next, the reaction pathway was branched to form the enyne substrates 3 by N-allylation and the diyne substrates 4 by N-propargylation (18, 19). Notably, the TBDAS linker withstood these strongly basic reaction conditions, and the reactions proceeded in good yields, comparable to those previously obtained in solution phase (3a, 87% vs. 98%; 3b, 72% vs. 76%; 3c, 88% vs. 80%; 3d, 81%; 4a, 86% vs. 82%; 4b, 82% vs. 90%; 4c, 85% vs. 82%; 4d, 79%) (12). Because the terminal alkynes (3d, 4d) were more broadly effective substrates compared to the trimethylsilyl (TMS)-alkynes (3c, 4c) in the original solution-phase studies (12), and afford identical products after desilylation, the former were used in most of the subsequent transition metal-mediated cycloaddition and cyclization reactions. |
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