An efficient ruthenium-catalyzed synthesis of alkyl-1,3,5-triazies from arylallyl alcohols and biguanides has been developed. The reaction occurred in moderate to good yields and tolerated heterocyclic or aryl allyl alcohols containing functionalities such as alkanes, ethers, and halogens. The reaction proceeds through a one-pot sequence of transfer hydrogenation and condensation steps.
An efficient synthetic pathway for the total synthesis of salvianolic acid N has been reported. The key reaction steps, the Wittig reaction for Z-stereoselectivity and an intramolecular cyclization for a seven membered ring skeleton, have been optimized to improve the synthetic feasibility and provide the best conditions in terms of yield. Moreover, a notable reaction is the reaction of the deprotected allylic group with Pd catalyst. An improved overall yield of 11% has been achieved for salvianolic acid N starting from 3,4-dimethoxybenzaldehyde in 11 steps.
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