成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List 2-Azido-2-deoxy-D-glucopyranose 1,3,4,6-Tetraacetate
171032-74-9

2-Azido-2-deoxy-D-glucopyranose 1,3,4,6-Tetraacetate synthesis

6synthesis methods
-

Yield:171032-74-9 84%

Reaction Conditions:

Stage #1:(+)-D-glucosamine hydrochloride with copper(ll) sulfate pentahydrate;triflic azide;triethylamine in water at 20;
Stage #2:acetic anhydride with pyridine;dmap

Steps:

l,3,4,6-Tetra-i?-acetyl-2-azido-2-deoxy-a/p-D-glucopyranose (12).
l,3,4,6-Tetra-i?-acetyl-2-azido-2-deoxy-a/p-D-glucopyranose (12). D-Glucosamine hydrochloride (1.00 g, 4.64 mmol) was dissolved in water (5.0 mL). Triethylamine (937 mg, 9.27 mmol) was added, along with copper sulphate pentahydrate (12 mg, 0.05 mmol). Triflic azide stock solution was then added. The blue mixture was stirred rapidly overnight, and then reduced in vacuo (water bath temperature kept below 20 °C). The resultant green syrup was dissolved in pyridine (10.0 mL), and acetic anhydride (3.0 mL) and DMAP (50 mg) were added slowly. After stirring overmght, the reaction mixture was evaporated to dryness, and the resulting residue was purified by flash chromatography (hexane/EtOAc, 3:2) to yield 12 as a yellow solid (1.44 g, 84%, predominately β anomer); i?f 0.13 (hexane/EtOAc, 4:1); JH NMR data were in agreement with those reported earlier. [221

References:

UNIVERSITY OF MANITOBA;ARTHUR, Gilbert;SCHWEIZER, Frank;SAMADDER, Pranati;XU, Yaozu WO2013/116949, 2013, A1 Location in patent:Page/Page column 32

FullText

2-Azido-2-deoxy-D-glucopyranose 1,3,4,6-Tetraacetate Related Search: