The medicinally important indole group was also incorporated (12a). Pleasingly, 3-arylazetidine radicals could also be formed under the reaction conditions and a range of 3,3-disubstituted azetidines were synthesized in comparable yields to their oxetane analogs (13a, b, m, n, p, q, t). Azetidine pyridines 13q and 13t showed a boost in yield compared to the oxetanes. Further information on the examples in Scheme 2 that showed significant amounts of side products and other radical acceptors that did not yield the desired Giese product can be found in Supporting Schemes S5 and S6, respectively. The Cbz group could be readily removed from 13a by hydrogenolysis to generate a free N-H azetidine (14; 76% yield). Ester hydrolysis from the functionalized oxetane products under basic conditions using LiOH gave carboxylic acid 15 in 99% yield. This is the formal bis-homologation product of oxetane 1, which was further characterized by X-ray crystallography (see Supporting Figure ). Interestingly, deprotection of the t-Bu ester 11b using trifluoroacetic acid prompted ring-opening of the oxetane ring to form tetrahydropyranone 16 in 97% yield due to the internal nucleophile.