Hydroxy- and acetoxy-mercuration of D-glucal triacetate
作者:K. Takiura、S. Honda
DOI:10.1016/s0008-6215(00)82707-x
日期:1972.8
Abstract Hydroxy- and acetoxy-mercuration of D -glucal triacetate ( 1 ) afforded 2-acetoxymercuri-3,4,6-tri- O -acetyl-2-deoxy- D -glucose ( 2 ) and 2-acetoxymercuri-1,3,4,6-tetra- O -acetyl-2-deoxy-α- D -glucopyranose ( 3 ), respectively. On demercuration with sodium borohydride, compound 2 gave at first the acyclic 4,6-di- O -acetyl- D - erythro -hex-2-enose ( 4 ), which was further reduced to the
Iodine-Catalyzed Highly Diastereoselective Synthesis of<i>trans</i>-2,6-Disubstituted-3,4-Dihydropyrans: Application to Concise Construction of C28-C37 Bicyclic Core of (+)-Sorangicin A
作者:Debendra K. Mohapatra、Pragna P. Das、Manas Ranjan Pattanayak、J. S. Yadav
DOI:10.1002/chem.200902999
日期:2010.2.15
A novel iodine‐catalyzed highlydiastereoselectivesynthesis of trans‐2,6‐disubstituted‐3,4‐dihydropyrans have been achieved from δ‐hydroxy α,β‐unsaturated aldehydes by treating with allyltrimethyl silane in THF at room temperature with good to excellent yields. This methodology has been successfully implemented for a concise asymmetric synthesis of C28–C37 dioxabicyclo[3.2.1]octane ring system of
Indium(III) Chloride Catalyzed, Novel and Efficient Synthesis of Sugar-Annulated N-Aryltetrahydropyridines
作者:B. Reddy、Ch. Vani、Zubeda Begum、J. Yadav、T. Rao
DOI:10.1055/s-0030-1258336
日期:2011.1
derived from arylamines and 1,3-diketones in the presence of 10% InCl3 in CH2Cl2 under mild reaction conditions to afford sugar fused N-aryltetrahydropyridine derivatives in good yields with high selectivity. The salient features of this method are high conversions, mild reaction conditions, short reaction times, high selectivity and operational simplicity. Perlin aldehyde - 1,3-diketones - indium(III)
δ-Hydroxy-α,β-unsaturated sugar aldehydes (Perlin aldehydes) undergo smooth coupling with β-enamino ketones and β-enamino esters generated in situ from arylamines and 1,3-dicarbonyl compounds in the presence of 10 mol% InCl3 in acetonitrile at 80 ËC, to produce oxa-aza-bicycles in good yields with high selectivity.