Click chemistry and biocatalysis for the preparation of pancratistatin analogs
摘要:
Tricyclic compounds that are advanced precursors for the synthesis of analogs of the antitumoral alkaloid pancratistatin were prepared by a short sequence that involved enzymatic dihydroxylation, epoxidation, and intramolecular Huisgen cycloaddition. (c) 2010 Elsevier Ltd. All rights reserved.
Chemoenzymatic synthesis of glycosyl-deoxyinositol derivatives. First example of a fagopyritol β-analogue containing an aminoinositol unit
摘要:
The first synthesis of two fagopyritol beta-analogues (beta-D-galactopyranosyl-(1' -> 1)-conduramine F-4 and beta-D-galactopyranosyl-(1' -> 3)-4-aminodeoxy-L-chiro-inositol) has been accomplished by a chemoenzymatic route in satisfactory yields. The key step of the synthesis is the TMSOTf-promoted glycosylation reaction of a deoxyconduritol derivative. The methodology is amenable to scale-up and expandable to the preparation of other pseudofagopyritols. (C) 2009 Elsevier Ltd. All rights reserved.