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No, your termination of rental agreement must follow the clauses of contract termination as it is mentioned in the agreement. You buying a house wont give you any relaxation in those terms.

i am not sure this answers my question

It wasnt you who asked the question

    I have a one year lease that I just signed. Does buying a house allow me to cancel my current lease without penalty?
        -@tunayofli

The sense of Aneesh's answer is correct.

You need to provide details on the clauses regarding termination of your lease as well as whatever information makes you believe that the purchase might override the lease. Are the landlord and the seller the same person?

No. The clauses says that I have to inform him 3 months before the end date of the contract? what is the penalty for this situation?

In that case the purchase is irrelevant to the lease. This matter as well as the penalization for early termination can be ascertained only by reading the lease.