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Org Lett. 2012 Dec 21;14(24):6306-9. doi: 10.1021/ol303070k. Epub 2012 Dec 4.

Complementary asymmetric routes to (R)-2-(7-hydroxy-2,3-dihydro-1H-pyrrolo[1,2-a]indol-1-yl)acetate.

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  • 1Department of Medicinal Chemistry, Arena Pharmaceuticals, 6154 Nancy Ridge Drive, San Diego, California 92121, United States.


Two distinct and scalable enantioselective approaches to the tricyclic indole (R)-2-(7-hydroxy-2,3-dihydro-1H-pyrrolo[1,2-a]indol-1-yl)acetate, an important synthon for a preclinical S1P(1) receptor agonist, are reported. Route 1 employs a modified version of Smith's modular 2-substituted indole synthesis as the key transformation. Route 2 involves a highly enantioselective CuH-catalyzed 1,4-hydrosilylation as the stereodefining step. Both routes can be performed without chromatography to provide multigram quantities of the tricycle in ≥98% ee.

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