Synthesis of anti-tumour phosphatidylinositol analogues from glucose by the use of ring-closing olefin metathesis
作者:Thomas L. Andresen、Dorthe M. Skytte、Robert Madsen
DOI:10.1039/b411021h
日期:——
A divergent strategy is described for synthesis of the novel phosphatidylinositols 1-3. The synthetic approach commences from benzyl-protected methyl 6-iodo-6-deoxy-alpha-D-glucopyranoside, which undergoes zinc-mediated reductive fragmentation followed by vinyl Grignard addition and ring-closingmetathesis to afford the key conduritol B intermediate 7. This can trifurcate to form three different benzyl-protected
Kinetic resolutions and kineticasymmetrictransformations (KAT) as well as dynamickinetic resolutions and dynamickineticasymmetrictransformations (DYKAT) are important synthetic protocols. The feasibility of KAT and DYKAT processes for asymmetric allylic alkylations (AAA) is explored utilizing a single substrate--conduritol B tetraesters. Both processes can be performed resulting in excellent
Stereoselective Formal Synthesis of (+)- and (−)-Cyclophellitol and (−)-Conduritol-B and Synthesis of (−)-Conduramine-B Derivative Using a Sulfinyl Moiety for C–O Bond Formation and α-Chloro Sulfide for C–C Bond Formation
intermediate, obtained by regio- and stereoselective vicinal functionalization of a diene utilizing an intramolecular sulfinyl group as a nucleophile, followed by stereoselective preparation of an allylic sulfide by reaction of vinylzinc bromide with an electrophilic α-chloro sulfide, and last by ring-closing metathesis reaction as the key steps. The sulfoxide, sulfilimine, and sulfur ylid prepared from this common
Pd Catalyzed kinetic resolution of conduritol B. Asymmetric synthesis of (+)-cyclophellitol
作者:Barry M. Trost、Erik J. Hembre
DOI:10.1016/s0040-4039(98)02274-6
日期:1999.1
Enantiomerically pure (+)-cyclophellitol is readily available from benzoquinone employing an asymmetric palladium catalyzed kinetic resolution of racemic conduritolB and a novel easily cleavable pivalate analogue.