Abstract
On treatment with TFAA N-arylacetyl–DL–tryptophan esters 7 furnish N–trifluoroacetyl spiropentacyclic indolines 8 in 81–91% yields and, in some cases, small amounts (3–5%) of β-car-bolines 9.
Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 23, 1993 - Issue 3
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