Bi(OTf)3 and SiO2-Bi(OTf)3 as Effective Catalysts for the Ferrier Rearrangement#
作者:J. Babu、A. Khare、Y. Vankar
DOI:10.3390/10080884
日期:——
Bi(OTf)3 and SiO2-Bi(OTf)3 are found to effectively catalyze the Ferrierrearrangement of tri-O-acetyl glycals with different alcohols providing an effective routeto 2,3-unsaturated O-glycosides with good anomeric selectivity and good to excellentyields after short reaction times.
Protic Acid (HClO<sub>4</sub> Supported on Silica Gel)-Mediated Synthesis of 2,3-Unsaturated-<i>O</i>-glucosides and a Chiral Furan Diol from 2,3-Glycals
作者:Aditi Agarwal、Shikha Rani、Yashwant D. Vankar
DOI:10.1021/jo049415j
日期:2004.9.1
Perchloric acid supported on silica gel acts as an excellent reagent system in converting glucals into 2,3-unsaturated-O-glucosides in good to excellent yields in short reaction time with good a selectivity. Primary, secondary, and allylic alcohols, phenols, and thiols react with 3,4,6-tri-O-acetyl glucal with equal ease. In addition to this, a chiral furan diol is obtained from unprotected D-glucal or D-galactal in good yields.
Cholesterol-derived novel anti-apoptotic agents on the structural basis of ginsenoside Rk1
Design and synthesis of cholesterol-derived anti-apoptotic agents were described. The synthesized cholesterol analogs designed on the structural basis of ginsenoside Rk1 inhibited the undesirable apoptosis of human endothelial cells, which are induced by a vascular injury. In particular, analogue 1 possessing 4,6di-O-acetyl-2,3-dideoxyhex-2-enopyran linked to hydroxyl group of cholesterol exhibited the most effective anti-apoptotic activities at both 5 and 10 mu g/ml. (C) 2010 Elsevier Ltd. All rights reserved.
NOVEL VASCULAR LEAK INHIBITOR
申请人:Industry-Academic Cooperation Foundation
Yonsei University