DVOŘÁKOVÁ, Hana, DVOŘÁK, D., HOLÝ, Antonín. Coupling of 6-Chloropurines with Organocuprates Derived from Grignard Reagents: A Convenient Route to .I.sec./I. and .I.tert./I. 6-Alkylpurines. Tetrahedron Letters. 1996, 37(8), 1285-1288. ISSN 0040-4039. E-ISSN 1873-3581.