conformation (via UV and molecular mechanics calculations) of (S)-1 have been determined. (S)-1 has been employed as a chiral auxiliary in the stoichiometric syn-dihydroxylation of olefins obtaining opticallyactive 1,2-diols with e.e.s up to 98%.
Reductive cleavage of axially disymmetric tertiary amines and quaternary ammonium salts by lithium aluminium hydride. Synthesis of new 1,1′-binaphthyl substituted amines
Axially disymmetric tertiary amines or quaternary ammonium salts A are synthesized by double alkylation of primary or secondary amines with racemic or optically pure 2,2′-bis (bromomethyl)-1,1′-binaphthyl. Their reductive cleavage by lithiumaluminiumhydride in refluxing THF leads to chiral secondary or tertiary amines B, substituted by a binaphthyl unit, with high yields and absence of racemization
Chiral catalysis of additions of alkyllithiums to aldehydes
作者:Jean Paul Mazaleyrat、Donald J. Cram
DOI:10.1021/ja00405a052
日期:1981.7
Synthesis and resolution of axially chiral C2-symmetric 1,1′-binaphthyl-substituted tetramethylethylenediamines
作者:Jean-Paul Mazaleyrat
DOI:10.1016/s0957-4166(97)00301-7
日期:1997.8
The axially chiral TMEDA derivatives 1 and 2 in which tetramethylethylene-diamine is substituted respectively by one and two 1,1'-binaphthyl units at their 2,2'positions, are of interest as chiral catalysts. Experimental details of their preparation in enantiomerically pure form are given. Two different routes have been followed, involving alkylation of both N,N-dimethyl ethylenediamine and ethylenediamine by 2,2'bis-(bromomethyl)-1,1'-binaphthyl either enantiomerically pure as prepared from resolved 1,1'-binaphthyl-2,2'-dicarboxylic acid or racemic, the resulting racemic diamines 1 and 2 being then resolved with dibenzoyl-tartaric acid. (C) 1997 Elsevier Science Ltd.