The automatic redemption, best known as autocall, of structured products has become an usual practice in the international market with regard to the indexation of contracts that aim capital leverage through financing strategies involving derivatives. The focal goal in this work is the pricing analysis by autocall’s dynamic in an issue of coupon barrier notes based in ADRs (starts on 02/04/2011 and ends on 04/02/2012) from the largest mining and metal company in the country, Vale S.A. (VALE). This study intend to explain in details the dynamics of autocall: how it is structured, how they are affected by the time in the redemption dates; the probability of being rescued (callables) on each date; the determination of the due payment in the coupon date and how these payments are dependents from these characteristic instruments and the main structured products structured with autocall. The numerical analysis model will be based on a modification of the trinomial tree model. In this proposal variation, were added the conditionals (autocall, barrier and knock-in) and the modification to calculate the present value of the structured product. Thus, through this article, the idea is to put a new development of calculus that involves autocall pricing in practice in order to make the valuation of structured products (with a similar typology to this issue of VALE), and introduce this subject in the Brazilian academic field as any other article dealt with this subject before.