B-Ring unsaturated estrogens: biological evaluation of 17α-Dihydroequilein and novel B-Nor-6-thiaequilenins as tissue selective estrogens
摘要:
The pharmacology and SAR of representative equine estogens is described. 17alpha-Dihydroequilenin was found to prevent bone loss after 5 weeks of oral administration to ovariectornized rats. The stereochemical significance of the D-ring and the C/D ring juncture was investigated with a series of benzothiophene-based equilenin analogues. (C) 2003 Published by Elsevier Ltd.
B-Ring unsaturated estrogens: biological evaluation of 17α-Dihydroequilein and novel B-Nor-6-thiaequilenins as tissue selective estrogens
摘要:
The pharmacology and SAR of representative equine estogens is described. 17alpha-Dihydroequilenin was found to prevent bone loss after 5 weeks of oral administration to ovariectornized rats. The stereochemical significance of the D-ring and the C/D ring juncture was investigated with a series of benzothiophene-based equilenin analogues. (C) 2003 Published by Elsevier Ltd.
Practical Preparation of Diosphenols by Ring Opening of α,β-Epoxyketones Catalyzed by Silica Gel Supported Acids
作者:Yuefei Hu、Rui Zhu、Lixin Xing、Xinyan Wang、Chuanjie Cheng、Bo Liu
DOI:10.1055/s-2007-985584
日期:——
The mixed acid (H 2 SO 4 -HOAc) catalyzed ring opening of α,β-epoxyketone was the most used method for the preparation of diosphenols, but it seriously suffered from poor yields and -tedious workup operations. By using silica gel supported mixed acid (H 2 SO 4 -HOAc), a variety of α,β-epoxyketones were converted into the corresponding diosphenols in unprecedented high yields within a few minutes.
混酸(H 2 SO 4 -HOAc)催化α,β-环氧酮开环是制备二酚类化合物最常用的方法,但其收率低,后处理操作繁琐。通过使用硅胶负载的混合酸(H 2 SO 4 -HOAc),各种α,β-环氧酮在几分钟内以前所未有的高产率转化为相应的二酚。