Symmetrical vicinal (R*,R*)-d,l-diamines were prepared from the corresponding imines and low valent titanium species generated by the action of titanium tetrachloride on amalgamated magnesium.
and versatile approach to 1,2-diamines has been developed based on reductivecoupling reactions of various imines, where perylene, an aromatic hydrocarbon, was used as a photoredox catalyst under visiblelight irradiation using a white light-emitting diode. The use of 1 mol % perylene enabled almost complete conversion of the imines, leading to the formation of their corresponding 1,2-diamines, which
New reaction protocols have been established to perform the reductive coupling of N-benzyl benzaldimines to 1,2-diphenyl-1,2-diaminoethanes in mild, stereoselective, and catalytic conditions by the use of SmI2 and Yb(OTf)(3). (C) 1998 Elsevier Science Ltd. All rights reserved.
Zn-mediated catalytic photoreduction of aldimines. One-pot synthesis and separation of meso and d,l C2 symmetrical diamines
作者:Marı́a Ortega、Miguel A Rodrı́guez、Pedro J Campos
DOI:10.1016/j.tet.2004.06.029
日期:2004.7
A new one-pot method for the synthesis and selective separation of 1,2-diamines is reported. The methodology, which involves the photoreduction of imines using catalytic amounts of zinc as a photosensitizer, allows the direct preparation and separation of meso and d,l compounds on a multigram scale. (C) 2004 Elsevier Ltd. All rights reserved.