An Atom-Economical Approach to Conformationally Constrained Tricyclic Nitrogen Heterocycles via Sequential and Tandem Ugi/Intramolecular Diels−Alder Reaction of Pyrrole1,2
2004 ◽
Vol 69
(4)
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pp. 1207-1214
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1999 ◽
Vol 40
(10)
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pp. 1851-1854
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1993 ◽
pp. 1802-1803
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1996 ◽
Vol 37
(22)
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pp. 3815-3818
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