Synthesis of activated esters of N-protected amino-acids
作者:Y. Wolman、D. Ladkany、Max Frankel
DOI:10.1039/j39670000689
日期:——
A simplified method for the synthesis of activatedesters of N-protected amino-acids is described. The synthesis proceeds through the aminolysis of various active esters of t-butyl or benzyl carbonate, and the leaving group displaced in this process becomes reincorporated by the additon of dicyclohexylcarbodi-imide to the reaction mixture, to give the desired compound.
Water-soluble mesoporphyrin compounds and methods of preparation
申请人:——
公开号:US20040097481A1
公开(公告)日:2004-05-20
Water soluble tin mesoporphyrin compounds are described. Methods of preparation of water soluble metal mesoporphyrin compounds and pharmaceutical preparations are also described.
The invention relates to a method for preparing polyhydroxy-urethanes without using a compound having an isocyanate function, and from amino compounds and compounds carrying carbonate functions, in particular cyclic carbonate functions. The invention also relates to a method for preparing aqueous or hydro-organic formulations containing polyhydroxy-urethanes, and to the use of said polyhydroxy-urethanes and of said aqueous or hydro-organic formulations.
The invention relates to a method for preparing polyhydroxy-urethanes without using a compound having an isocyanate function, and from amino compounds and compounds carrying carbonate functions, in particular cyclic carbonate functions. The invention also relates to a method for preparing aqueous or hydro-organic formulations containing polyhydroxy-urethanes, and to the use of said polyhydroxy-urethanes and of said aqueous or hydro-organic formulations.