A convenient and new approach to the synthesis of omega-heterocyclic amino acids from carboxy lactams through ring-chain-transformation
Singh Rakesh K., Sinha Neelima, Jain Sanjay, Salman Mohammad, Naqvi Fehmida, Anand Nitya
Tetrahedron, 61 (2005) N 37, 8868-8874
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http://dx.doi.org/doi:10.1016/j.tet.2005.07.018
William G. Finnegan, Ronald A. Henry, and G. B. L. Smith
J. Am. Chem. Soc.; 1952; 74(12) pp 2981 - 2983;
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http://dx.doi.org/10.1021/ja01132a007