186136-11-8Relevant academic research and scientific papers
An approach to highly functionalized dendrimers from chiral, non-racemic synthetic monomers
McGrath, Dominic V.,Wu, Mu-Jen,Chaudhry, Umer
, p. 6077 - 6080 (1996)
An approach to dendrimers with highly functional interiors constructed from chiral, non-racemic hydrobenzoin monomer units is presented. An optically pure monomer unit is prepared using asymmetric dihydroxylation (AD) and a representative dendrimer is constructed by a convergent growth strategy.
Asymmetric Synthesis of a Series of Chiral AB2 Monomers for Dendrimer Construction
McElhanon, James R.,Wu, Mu-Jen,Escobar, Maya,Chaudhry, Umer,Hu, Chun-Ling,McGrath, Dominic V.
, p. 908 - 915 (2007/10/03)
Efficient preparation of a series of four chiral, nonracemic AB2 monomers suitable for the construction of dendrimers is presented. Monomers 1-4 possess the common structural features of a diphenolic moiety and a benzylic or aliphatic hydroxyl which render these molecules suitable for convergent dendrimer synthesis. The same basic, high-yielding, five-step sequence is employed for 1-4. Stilbene derivatives 13 and 14 are prepared by a Horner-Wadsworth-Emmons modified Wittig reaction between 3,5- or 3,4-bis(benzyloxy)benzaldehyde (8 and 10) and an ester-substituted benzylphosphonate (11 or 12). Cinnamate derivatives 21 and 22 are prepared similarly from 8 and 10 and triethyl phosphonoacetate. Chirality is introduced in the form of a 1,2-diol unit by Sharpless asymmetric dihydroxylation (AD) (>97% ee in all cases). Protection of the 1,2-diols as their acetonide derivatives provides dioxolane intermediates 17, 18, 25, and 26. Reduction of the ester groups followed by hydrogenolysis of the benzyl ethers yields AB2 monomers 1-4 in 57-67% overall yield from 8 and 10.
