Synthesis and X-ray structure of a C5-C4-linked glucofuranose-oxazolidin-2-one

Crystal structure of 6-azido-6-de-oxy-1,2-O-iso-propyl-idene-α-d-gluco-furan-ose

Short syntheses to high Fsp³ index natural-product analogues such as imino­sugars are of paramount importance in the investigation of their biological activities and reducing the use of protecting groups is an advantageous synthetic strategy. In this case only an iso­propyl­idene group was employed towards the synthesis of seven-membered ring imino­sugars.

Short syntheses to high Fsp³ index natural-product analogues such as imino­sugars are of paramount importance in the investigation of their biological activities and reducing the use of protecting groups is an advantageous synthetic strategy. An iso­propyl­idene group was employed towards the synthesis of seven-membered ring imino­sugars and the title compound, C₉H₁₅N₃O₅, was crystallized as an inter­mediate, in which the THF ring is twisted and the dioxolane ring adopts an envelope conformation: the dihedral angle between the rings is 67.50 (13)°. In the crystal, the hydroxyl groups participate in O—H⋯(O,O) and O—H⋯N hydrogen-bonding inter­actions, which generate chains of mol­ecules propagating parallel to the a-axis direction. There is a notable non-classical C—H⋯O hydrogen bond, which cross-links the [100] chains into (001) sheets.

Carbon dioxide as a primary oxidant and a C1 building block

2,3-Dihydro-2,2,2-triphenylphenanthro[9,10-d]-1,3,2-λ⁵-oxazaphospholes react with carbon dioxide in an overall second order reaction at room temperature to give 3H-phenanthro[9,10-d]oxazol-2-ones and triphenylphosphine oxide in good yields.