Long chain branched dendrimers 1, 2 and 3 were easily prepared according to the convergent strategy based on the A2B type monomer from 5-hydroxyisophthalic acid. These dendrimers have a nucleophilic phenol focal group, which is useful to further chemistry.
Phebaclavin A （1） and C （2） were synthesized in 60% and 58% total yields over 5 steps from commercially available starting meterials respectively. The synthesis feature was usage of the Wittig reaction twice and solvent-free cyclizing reaction as the key steps.
The compound sulforaphane （SFN, 1） has been synthesized via a facile and green synthetic strategy based on the modification of previous methods. Because of its high bioactivities and rare content in nature, the present work is of great important significance.
