In the present work, a propylphosphonicanhydride (T3P®) assisted Robinson–Gabriel cyclization of N-acyl-β-oxotryptamines for the synthesis of 2-substituted-5-(3-indolyl)oxazoles has been developed. The reactions proceeded smoothly in acetonitrile under microwave irradiation, and the product isolation required only an extraction and subsequent crystallization; no chromatography was necessary. The desired
Isolation of Labradorins 1 and 2 from <i>Pseudomonas syringae</i> pv. <i>coronafaciens</i>
作者:George R. Pettit、John C. Knight、Delbert L. Herald、Richard Davenport、Robin K. Pettit、Bruce E. Tucker、Jean M. Schmidt
DOI:10.1021/np020173x
日期:2002.12.1
Investigation of Pseudomonas syringaepv. coronafaciens cancer cell growth inhibitory constituents led to the isolation of 2-isobutyl-5-(3-indolyl)oxazole (1) and 2-n-pentyl-5-(3-indolyl)oxazole (2f), designated labradorins 1 (1) and 2 (2f), related to pimprinine (2a). The structures were deduced by spectroscopic techniques and X-ray crystal structure determinations. Labradorin 1 (1) afforded GI(50)