Ortho-Condensed oxane/polyoxygenated macrorings by ruthenium-catalyzed ring closing metathesis
摘要:
A highly efficient and flexible route to trans-fused oxane/macrocyclic polyethers is outlined, which is based on the formation of 15-, 18-, and 21-membered oxacycles by ring-closing metathesis (RCM) as the key step. (C) 1997 Elsevier Science Ltd.
SmI2-induced reductive cyclization of optically active β-alkoxyvinyl sulfoxides with aldehyde
作者:Tomohiro Kimura、Mayumi Hagiwara、Tadashi Nakata
DOI:10.1016/j.tetlet.2007.10.102
日期:2007.12
SmI2-induced reductive cyclization of opticallyactive (E)- and (Z)-β-alkoxyvinyl sulfoxides with aldehyde was developed for the construction of several stereoisomers of tetrahydropyran derivatives.
The present invention relates to the cell-based production of bacterial nonulosonates and their biosynthetic precursors. Specifically, the present invention provides recombinant cells for the production of pseudaminic acid, legionaminic acid, UDP-2,4-diacetamido-2,4,6-trideoxy-β-L-altropyranose, and UDP-2,4-diacetamido-2,4,6-trideoxy-α-D-glucopyranose. Methods for producing the sugars are also provided.