... Tetrahedron. Volume 64, Issue 2, 7 January 2008, Pages 328–338. Cover image Cover image. ... Total syntheses of lamellarins O, P, Q, and R from 28 are shown in Scheme 6. Alkylation of 28 with phenacyl bromide 30 in the presence of K 2 CO 3 in DMF produced 32 in 87% yield. ...