| abstract |
A process for preparing a compound of the formula wherein n, R1, R2, R3 and X are as defined above, used as an intermediate in the synthesis of beta-adrenergic receptor agonists. A process for preparing a compound of the formula IX wherein n is 0; R1 is halo; R3 is a silyl protecting group; X is p-toluenesulfonyloxy; comprising reacting a compound of the formula X wherein n, R1 and X are as defined above, with a silyating agent in the presence of a base. |