Trifluoroacetyl as an Orthogonal Protecting Group for Guanidines
作者:Sandra Bartoli、Kim B. Jensen、Jeremy D. Kilburn
DOI:10.1021/jo0348874
日期:2003.11.1
The trifluoroacetyl moiety has been used as a new protecting group for guanidine functionality. The protecting group is easily cleavedundermild basic conditions and is complementary to the Boc, Cbz, and Ddpe protecting groups. The protecting groupcan be applied to peptide synthesis in solution as well as on a solid phase as it is orthogonal to a Boc and Cbz strategy and semiorthogonal to an Fmoc
synthesis and characterization of the so far largest polycyclicaromatichydrocarbon (PAH), containing 222 carbon atoms or 37 separate benzene units. First a suitable three-dimensional oligophenylene precursor molecule is built up by a sequence of Diels-Alder and cyclotrimerization reactions and then planarized in the final step by oxidative cyclodehydrogenation to the corresponding hexagonal PAH. Structural