Amine-Regulated pri-SMTP Oxidation in SMTP Biosynthesis in Stachybotrys: Possible Implication in Nitrogen Acquisition

Total Synthesis of Stachybotrys microspora Triprenol Phenol-7 (SMTP-7)

The first total synthesis of Stachybotrys microspora triprenol phenol (SMTP)-7 is described. Establishment of the two pyran ring stereogenic centers and key reactions featuring a double reductive amination and a double lactam ring formation in flow are described. The (2R,3S)-trans-benzopyran intermediate 7A, isolated by chiral preparative SFC chromatography, was carried forward to afford SMTP-7. Analytical data for synthetic SMTP-7, including 1H and 13C NMR data, HPLC retention time, and UV spectrum, were in excellent agreement with those for natural SMTP-7.