1H NMR Reassignment for Z/E-Benzomalvins B and Absolute Configuration of Benzomalvin C

Total Synthesis of Racemic Benzomalvin E, a Quinazolinone Isolated from Pencilium sp. FN070315 and Exploration to the Direct Synthesis of (E)-Benzomalvin B

“…1 H and 13 C data for compound 1 matched with the data for the naturally isolated product (see the NMR comparison in Table S1). Structural assignment was made with additional information from gCOSY, gNOESY, and gHMBC data (Figure ). The signals from the 1 H, 13 C, DEPT, and HMBC data of (±)-benzomalvin E 1 revealed the presence of several carbon types, including N -methyl carbon at δ C 37.4, two methine sp 3 carbons (δ C 74.2 and 70.2), 13 sp 2 carbons, six quaternary sp 2 carbons, and two carbonyl carbons (δ C 164.7 and 161.2).…”