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Volumn 55, Issue 33, 1999, Pages 9947-9978

C-Acylnitrilium ion initiated cyclizations in heterocycle synthesis

Author keywords

[No Author keywords available]

Indexed keywords

ALKALOID; ALKENE DERIVATIVE; DENDROBINE; IODIDE; ISONITRILE DERIVATIVE; ISOQUINOLINE DERIVATIVE; NITRILE; PYRROLINE DERIVATIVE; SAMARIUM; SILANE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0033551720     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4020(99)00565-7     Document Type: Review
Times cited : (29)

References (90)
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    • 8b The reaction conditions employed in this early account were far harsher than necessary (benzene, reflux) and the product yields were presumably lowered as a consequence.
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    • The greater reactivity of acyl bromides permits the desired insertion reactions to be conducted at temperatures as low as 0 °C. In some instances this characteristic has proven advantageous.
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    • The structure assigned to the erythrinane 10 was fully supported by proton decoupling experiments and nuclear Overhauser difference spectroscopy.
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    • Evidence for the existence of a trans-fused B, C ring junction in 40 was provided by 300-MHz NOE experiments. A definitive assignment awaits single crystal X-ray structure determination.
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    • 34b was also examined as a reducing agent for the preparation of 42. In this instance 42 was produced along with its C-10 epimer in a ration of 93:7. In addition, the reaction was not amenable to scale up:
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    • The tricyclic imines 67d and 67e were found to undergo slow decomposition at room temperature but could be stored indefinitely in a benzene matrix under argon at -20 °C.
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    • Azabicyclo[3.3.1]nonane 86a was isolated from this mixture by careful chromatography on silica gel and was fully characterized.
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    • The stereochemical disposition of the hydroxy group of 88 has not been determined.
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    • In contrast to the cis-pyrrolines, the only significant NOE enhancements that were observed upon irradiation of the C-4 and C-2 methine hydrogens in the minor trans isomers were to different hydrogens on the central C-3 methylene: (formula presented)
    • In contrast to the cis-pyrrolines, the only significant NOE enhancements that were observed upon irradiation of the C-4 and C-2 methine hydrogens in the minor trans isomers were to different hydrogens on the central C-3 methylene: (formula presented)


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