the present invention relates to novel pyrrolobenzodiazepines compounds of general formula v as shown below , which are useful as potential antitumour agents and a process of preparing these compounds ; particularly the present invention provides a process for the preparation of 7 - methoxy - 8 -- 1 , 2 , 3 , 10 , 11 , 11a - hexahydro - 5h - pyrroloben - zodiazepine - 5 - one - 8 - yloxy ] alkyloxy }-- 1 , 2 , 3 , 11a - tetrahydro - 5h - pyrrolobenzodiazepin - 5 - one , with varying aliphatic chain length and its 2 - hydroxy derivatives .