Tri-o-tolylphosphine → (E)-tert-butyl 8-(3-(methyl((3-methylbenzofuran-2-yl)methyl)amino)-3-oxoprop-1-enyl)-1,2,3,4-tetrahydropyrido[2,3-b][1,5]diazocine-5(6H)-carboxylate

Participants

Reaction Conditions

Reaction Steps

A suspension of tert-butyl 8-bromo-1,2,3,4-tetrahydropyrido[2,3-b][1,5]diazocine-5(6H)-carboxylate (45 mg, 0.13 mmol), N-methyl-N-((3-methylbenzofuran-2-yl)methyl)acrylamide (90 mg, 0.39 mmol) and (i-Pr)2EtN (0.11 mL, 0.66 mmol) in 3.75 mL of DMF:propionitrile (4:1) was de-oxygenated with Ar for 30 min. The mixture was treated with Pd(OAc)2 (3.0 mg, 0.013 mmol) and P(o-tol)3 (8.0 mg, 0.026 mmol) then heated to 110° C. for 20 h. The hot mixture was filtered through a pad of celite and washed with ethyl acetate 2×20 mL. The filtrate was concentrated in vacuo to obtain crude brown oil product. The resulting crude product was subjected to prep HPLC purification to obtain pure product as an off-white solid. Yield 39 mg (60%); ESI MS m/z 491 [C28H34N4O4+H]+

Provenance & Evidence