which was then applied in the total synthesis of THPBs including l-SPD. The chemical structures of 31 designed compounds (17a–18z and 24a–24e) are shown in Table 1. These compounds were synthesized through the routes outlined in
which was then applied in the totalsynthesis of THPBs including l-SPD. The chemical structures of 31designed compounds (17a–18z and 24a–24e) are shown in Table 1.These compounds were synthesized through the routes outlined in