A new simple route to deoxyamino sugars from non-sugar material: synthesis of d-tolyposamine and 4-epi-d-tolyposamine and formal synthesis of d-vicenisamine
作者:Yoshitaka Matsushima、Jun Kino
DOI:10.1016/j.tetlet.2005.09.195
日期:2005.12
A new, simple strategy has been formulated for the synthesis of deoxyamino sugarsfrom a non-sugar starting material. Starting from the enantiomerically pure diol obtained from ethyl sorbate by Sharpless asymmetric dihydroxylation, the synthesis of two types of 2,3,4,6-tetradeoxy-4-amino sugars—d-tolyposamine and 4-epi-d-tolyposamine—, and formal synthesis of 2,4,6-trideoxy-4-amino sugar—d-vicenisamine—were
The first total syntheses of 3-epi-litsenolide D2 and its enantiomer lincomolide A were achieved. The synthetic highlights of our approach include olefin cross metathesis and bromine addition to the generated double bond, followed by the regioselective HBr-elimination and intramolecular carbonylation using bis(triphenylphosphine)dicarbonylnickel. This investigation also revealed that the previously
首次合成了3- epi- litsenolide D 2及其对映异构体lincomolideA。我们方法的合成亮点包括烯烃交叉复分解和向生成的双键中添加溴,然后使用双(三苯基膦)二羰基镍进行区域选择性HBr消除和分子内羰基化。这项研究还表明,应该修改以前报告的3- epi- litsenolide D 2的特定旋光度。
Intramolecular conjugate addition of γ- and δ-trichloroacetimidoyloxy-α,β-unsaturated esters in an acyclic system
作者:Yoshitaka Matsushima、Jun Kino
DOI:10.1016/j.tet.2008.02.061
日期:2008.4
An intramolecular conjugate addition of γ- and δ-trichloroacetimidoyloxy-α,β-unsaturated esters, a new way to construct 1,2-amino or 1,3-amino alcohol moieties in an acyclic system, is described. Very concise synthesis of d-vancosamine and 3-epi-d-vancosamine derivatives was also achieved utilizing this methodology.