Description Garg 4,5-indolyne precursor is an indolyne precursor developed by Professor Neil Garg and coworkers. It is widely used for the synthesis of various N-heterocyclic based compounds. It is also useful for the preparation of substituted indoles (Diels–Alder and azide cycloaddition products).Indolyne precursor can be activated under mild fluoride conditions, which are highly reactive with dienes and other dipolariphiles (e.g. azides) to provide cycloaddition products containing an indole motif. Description Garg 4,5-indolyne precursor is an indolyne precursor developed by Professor Neil Garg and coworkers. It is widely used for the synthesis of various N-heterocyclic based compounds. It is also useful for the preparation of substituted indoles (Diels–Alder and azide cycloaddition products).Indolyne precursor can be activated under mild fluoride conditions, which are highly reactive with dienes and other dipolariphiles (e.g. azides) to provide cycloaddition products containing an indole motif.