A new application of silicon Grignard reagents in C(sp3)−Si bond formation is reported. With the aid of BF3⋅OEt2, these siliconnucleophiles add across alkenes activated by various azaaryl groups under copper catalysis. An enantioselective version employing benzoxazole‐activated alkenes as substrates and a CuI‐josiphos complex as catalyst has been developed, forming the C(sp3)−Si bond with good to