1643-43-2Relevant articles and documents
Clear cut example of preference for a 6-membered ring radical cyclisation over the homologous 5-membered ring radical cyclisation. The reaction of 5-[bromoalkyl]-5H-dibenzo[a,d]cycloheptenes with Bu3SnH
Hada,Banciu,Mattalia,Chanon
, p. 3845 - 3848 (1996)
The radical cyclisation reaction of the 5-[2-bromo-ethyl]-5H-dibenzo[a,d]cycloheptene 4 with Bu3SnH and AIBN led to the cyclised hydrocarbon 5 as major product, whereas the bromo-derivative 8 with Bu3SnH and AIBN gave only the straight chain product 9. An explanation based on the conformational rigidity of dibenzo[a,d]cycloheptene system calculated by AMI method is proposed. Copyright
Cyclic amino acids and derivatives thereof
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, (2008/06/13)
Novel cyclic amino acids which are useful in preparing biologically active peptides as well as a process for the preparation of D and L enantiomers of the cyclic amino acids are described where an N-protected derivative of the racemic cyclic amino acid is treated with (-)cinchonidine and the resulting salt resolved into the desired enantiomers, as well as derivatives thereof and valuable intermediates used in the process.
Pharmaceutical composition having relaxing activity which contains a nitrate ester as active substance
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, (2008/06/13)
The invention relates to pharmaceutical compositions containing novel nitrate esters, of which it was found that they are useful for the treatment of ischemiatic heart diseases, decompensatio cordis, myocardial infarction and hypertension.