dipeptidic starting materials the resulting tripeptide compound p3 p2 p1 wherein r c is an alkoxy group may then be subjected to standard hydrolysis conditions to obtain the corresponding tripeptide compound wherein r c is hydroxyl examples of suitable hydrolysis conditions are as outlined above with respect to the hydrolysis step of scheme x additional embodiments of the invention are directed to the individual steps of the multistep general synthetic method described above and the individual intermediates used in these steps these individual steps and intermediates of the present invention are described in detail below all substituent groups are as defined in the general multi step method above the compounds that may be prepared by the processes of the present invention are compounds of the formula i as previously set forth i e compound of the following formula wherein het is a five six or seven membered saturated or unsaturated heterocycle containing from one to four heteroatoms selected from nitrogen oxygen and sulfur said heterocycle being substituted with r 1 at any available position on the heterocycle r 1 is r 20 u2014 nr 22 cor 20 u2014 nr 22 coor 20 u2014 nr 22 r 21 and u2014 nr 22 conr 21 r 23 wherein r 20 is selected from c 1 8 alkyl c 3 7 cycloalkyl and c 3 7 cycloalkyl c 1 4 alkyl wherein said cycloalkyl or cycloalkylalkyl may be.