17 beta-Amino steroids such as 17 beta-amino-1,3,5(10)-estratrien-3-ol (1), 17 beta-amino-5 alpha-androstan-3 beta-ol (2) and, 17 beta-amino-3 beta-hydroxyandrost-5-ene (3) have been widely used as a key intermediates in the synthesis of a variety of biologically active steroid derivatives though concise, high yielding syntheses of these compounds has yet to be reported. 17 beta-Amino-1,3,5(10)-estratrien-3-ol (1) and 17 beta-amino-5 alpha-androstan-3 beta-ol (2) were prepared in high yield by reductive amination of estrone and epiandrosterone using benzylamine and sodium triacetoxyborohydride followed by catalytic hydrogenolysis of the resulting 17 beta-benzylamino derivatives. Attempts to prepare 17 beta-amino-3 beta-hydroxyandrost-5-ene (3) from dehydroepiandosterone using a similar approach resulted in partial reduction of the double bond. 17 beta-Amino-3 beta-hydroxyandrost-5-ene (3) was ultimately obtained in high yield by reductive amination of dehydroepiandosterone using allylamine and sodium triacetoxyborohydride followed by removal of the allyl group from the resulting 17 beta-allylamino derivative with dimethylbarbituric acid and Pd(PPh3)(4) as catalyst. (C) 2011 Elsevier Inc. All rights reserved.
Estrone-Decorated Polyion Complex Micelles for Targeted Melittin Delivery to Hormone-Responsive Breast Cancer Cells
作者:Radhika Raveendran、Fan Chen、Ben Kent、Martina H. Stenzel
DOI:10.1021/acs.biomac.9b01681
日期:2020.3.9
chain-transfer (RAFT) polymerization. Estrone-conjugated poly(ethylene glycol) methyl ether methacrylate-b-poly tert-butyl methacrylate (POEGMEMA-PtBuMA) could complex with melittin to form PIC micelles of size around 60 nm ensuing from the electrostatic interaction of the deprotected polymer and melittin in aqueous media. Poly(ethylene glycol) methyl ether acrylate-b-poly acrylic acid (POEGMEA-PAA) was also