(+)-Rimocidin Synthetic Studies. Construction of an Advanced C(1−18) Polyol Fragment
摘要:
The synthesis of an appropriately functionalized advanced C(1-18) polyol fragment of the mycosamine-glycosylated polyene macrolide, (+)-rimocidin (1), has been achieved in a highly efficient manner. Highlights of the strategy include the S(N)2/S(N)2' addition of dithiane anions to vinyl epoxides and the multicomponent linchpin union of 2-TBS-1,3-dithiane with two advanced epoxides.
A Concise Enantioselective Entry to the Synthesis of Deoxy-azasugars
作者:Rubén Martín、Albert Moyano、Miquel A. Pericàs、Antoni Riera
DOI:10.1021/ol991280u
日期:2000.1.1
[reaction: see text] A concise enantioselective preparation of oxazolidinylpiperidine 4, a key intermediate in the synthesis of glycosidase inhibitors such as 1-deoxymannojirimycin or 1-deoxygalactostatin, has been developed. Sharpless catalyticasymmetric epoxidation of (E)-2,4-pentadienol followed by treatment with allyl isocyanate afforded epoxy carbamate 8. Regioselective intramolecular ring opening
A practical synthesis of<scp>d</scp>-erythro-sphingosine using a cross-metathesis approach
作者:Staffan Torssell、Peter Somfai
DOI:10.1039/b403568b
日期:——
Starting from a vinylepoxide, a short and practical synthesis of D-erythro-sphingosine is described. The key transformations are a regioselective opening of the vinylepoxide and an E-selective cross-metathesis, affording the target molecule in 5 steps and 51% overall yield.
Enantioselective synthesis of hydroxylated pyrrolidines via Sharpless epoxidation and olefin metathesis
作者:Caterina Murruzzu、Antoni Riera
DOI:10.1016/j.tetasy.2006.12.023
日期:2007.1
The enantioselective synthesis of polyhydroxylatedpyrrolidinesfromenantiomericallypure 2,3-epoxy-pent-4-en-1-ol 5 is described herein. The epoxy alcohol, readily available in any configuration by Sharpless epoxidation, was submitted to regioselective C-3 ring-opening with allyl amine, Boc-protection and ring-closing metathesis to yield dehydropyrrole derivative 7. From this key intermediate, 1
The enantioselective total synthesis of (+)-brasilenyne has been accomplished. The key features of the synthesis include the convergent preparation of a highly functionalized endocyclization precursor via selective epoxide opening, the construction of an oxonene skeleton through perfect regioselective Pd(0)-catalyzed endocyclization, and the installation of a 1,3-cis,cis-diene unit via a decarboxylative