Synthesis of cyclopentenimines from N-allyl ynamides via a tandem aza-Claisen rearrangement-carbocyclization sequence.

Synthesis of cyclopentenimines from N-allyl ynamides via a tandem aza-Claisen rearrangement-carbocyclization sequence.
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DOI:
10.1021/jo400960e
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发表时间:
2013-06-21
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
DeKorver KA
DeKorver KA
中科院分区:
其他
文献类型:
--
作者:
Wang XN;Winston-McPherson GN;Walton MC;Zhang Y;Hsung RP;DeKorver KA

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We describe here details of our investigations into Pd-catalyzed and thermal aza-Claisen–carbocyclizations of N-allyl ynamides to prepare a variety of α,β-unsaturated cyclopentenimines. The nature of the ynamide electron withdrawing group and β-substituent plays critical roles in the success of this tandem cascade. With N-sulfonyl ynamides, the use of palladium catalysis is required, as facile 1,3-sulfonyl shifts dominate under thermal conditions. However, since no analogous 1,3-phosphoryl shift is operational, N-phosphoryl ynamides could be used to prepare similar cyclopentenimines under thermal conditions through zwitter ionic intermediates that undergo N-promoted H-shifts. Alternatively, by employing ynamides bearing tethered carbon nucleophiles, the zwitter ionic intermediates could be intercepted giving rise rapidly to more complex fused bi- and tricyclic scaffolds.
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