NEW YORK -- Hobbled energy giant Enron Corp. (NYSE:ENE), in an effort to save its planned purchase by smaller rival Dynegy Inc. (NYSE:DYN), may cut the price of the all-stock transaction by more than 40 percent to about $5 billion, the Wall Street Journal reported on Tuesday. Enron also was negotiating to extend the maturity dates of some of its borrowings in order to stem a growing liquidity crisis according to people familiar with the matter, the paper said. The move to renegotiate the agreement, and particularly to cut the number of Dynegy shares that Enron holders would receive, two weeks after the pact's signing is virtually unheard of in corporate transactions, the Wall Street Journal said. Escape clauses built into the deal give Dynegy the option to back out if there is a serious deterioration in Enron's business or assets.