... J. Org. Chem. ... Table d No reaction. Table e ... figure Figure 2. Characteristic NOEs observed in the 1 H– 1 H NOESY analysis (NOESY, 400 MHz, CDCl 3 ) and 3D structures (generated in Chem3D, C: gray; H: white; N: blue; O: red) for compounds 41, 43, and 45. ...