Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 73, Issue 7, Pages 2792-2802Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo8001003
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- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0742663] Funding Source: National Science Foundation
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The total synthesis of several members of the vinca and tacaman classes of indole alkaloids has been accomplished. The central step in the synthesis consists of an intramolecular [3+2]-cycloaddition reaction of an alpha-diazo indoloamide which delivers the pentacyclic skeleton of the natural product in excellent yield. The acid lability of the oxabicyclic structure was exploited to establish the trans-DIE ring fusion of (+/-)-3H-epivincamine (3). Finally, a base induced keto-amide ring contraction was utilized to generate the E-ring of the natural product. A variation of the cascade sequence of reactions used to synthesize (+/-)-3H-epivincamine was also employed for the synthesis of the tacaman alkaloids (+/-)-tacamonine and (+/-)-apotacamine.
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