When developing chemical systems it’s of course important to gain a deep understanding of the chemical reaction process. 625-08-1, Name is 3-Hydroxy-3-methylbutanoic acid, SMILES is CC(C)(O)CC(O)=O, in an article , author is Jadhav, Prakash D., once mentioned of 625-08-1, HPLC of Formula: https://www.ambeed.com/products/625-08-1.html.
This work describes two distinct annulations between ynamides and 1,2-benzisoxazoles with chemo-selectivity controlled by ligands. With IPrAuCl/AgNTf2, aryl-substituted ynamides undergo [5+2]-annulation reactions, whereas P(t-Bu)(2)(o-biphenyl)AuCl/AgNTf2 alters the chemoselectivity of the same ynamides to implement [5+1]-annulation reactions. C-13-Labeling experiments confirm that a 1,2-sulfonamide shift is involved in the [5+1]-annulation process. A plausible mechanism is postulated to rationalize the mechanisms of the two annulations.
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Reference:
Benzisoxazole – Wikipedia,
,Benzisoxazole – an overview | ScienceDirect Topics