The first totalsynthesis of lajollamycin B, a structurally novel nitro‐tetraene spiro‐β‐lactone/γ‐lactone antibiotic, is described. The convergent synthesis involves the construction of the C8′–C11′ nitrodienylstannane and its coupling with the segment prepared from the C1′–C7′ ω‐iodoheptadienoic acid and the right‐hand heterocyclic fragment, which has been utilized for our previous syntheses of oxazolomycin A