Synthesis of [6,5,5]Ring‐Fused Tricyclic Triazoles by Copper‐Promoted Double Cyclization

Ring‐fused 1,2,3‐triazoles are important biologically active compounds and synthetic intermediates. Known methods for their synthesis are limited mostly to triazoles fused to six‐membered or larger rings. Herein we disclose a synthetic approach to triazoles fused to five‐membered rings based on copper(I)‐promoted double cyclization consisting of azide‐alkyne cycloaddition, followed by cross coupling to aryl iodides.