2899-07-2Relevant articles and documents
Synthesis of N-Benzyloxycarbonyl-N-methylaminoacids from Oxazolidine-5-one Derivatives
Chipens, G. I.,Slavinskaya, V. A.,Sile, D. E.,Korchagova, E. Kh.,Katkevich, M. Yu.,Grigor'eva, V. D.
, p. 576 - 578 (1992)
Hydrogenolysis of 3-benzyloxycarbonyloxazolidine-5-one and 3-benzyloxycarbonyl-4-benzyloxazolidine-5-one by Et3SiH in the presence of F3CCO2H is demonstrated to be a convenient method for preparing substituted N-methylaminoacids.In contrast with catalytic
Enantioselective direct α-amination of aldehydes via a photoredox mechanism: A strategy for asymmetric amine fragment coupling
Cecere, Giuseppe,Koenig, Christian M.,Alleva, Jennifer L.,MacMillan, David W. C.
, p. 11521 - 11524 (2013/09/02)
The direct, asymmetric α-amination of aldehydes has been accomplished via a combination of photoredox and organocatalysis. Photon-generated N-centered radicals undergo enantioselective α-addition to catalytically formed chiral enamines to directly produce stable α-amino aldehyde adducts bearing synthetically useful amine substitution patterns. Incorporation of a photolabile group on the amine precursor obviates the need to employ a photoredox catalyst in this transformation. Importantly, this photoinduced transformation allows direct and enantioselective access to α-amino aldehyde products that do not require postreaction manipulation.
Total synthesis and biological evaluation of tamandarin B analogues
Adrio, Javier,Cuevas, Carmen,Manzanares, Ignacio,Joullie, Madeleine M.
, p. 5129 - 5138 (2008/02/07)
(Chemical Equation Presented) Tamandarins A and B are a class of marine natural cyclodepsipeptides with structures and biological activities closely related to those of the didemnins. The easier synthetic access to tamandarins accelerates the preparation of new macrocyclic derivatives of this family of antitumor, antiviral, and immunosuppressive compounds. The optimization of the previously reported synthetic route to tamandarins by changing the macrolactamization site from Nst1 and Thr6 to Pro 4 and N,O-Me2Tyr5 residues led to a significant improvement in the reaction yield. Using this new synthetic approach, four new macrocyclic analogues of tamandarin B were prepared and evaluated for anticancer activity. These results provide further insight into the structure-activity relationship of the tamandarins and didemnins.