Chemoselective TBS deprotection of primary alcohols by means of pyridinium tribromide (Py·Br3) in MeOH
摘要:
A catalytic amount of pyridinium tribromide (Py center dot Br(3)) in MeOH chemoselectively deprotects primary TBS ethers in the presence of a Variety of other protecting and common functional groups in modest to excellent yields when performed at 0 degrees C. (C) 2008 Elsevier Ltd. All rights reserved.
described using triphenylmethanol in the presence of tris(pentafluorophenyl)borane (3 mol %) in dichloromethane at room temperature. The chemoselectivity of this protocol is demonstrated by studying the tritylation of a primary alcohol in the presence of a secondary alcohol and also the mildness of this catalyst was studied with substrates containing acid labile protecting groups.
SYNTHESIS OF ENT-PROGESTERONE AND INTERMEDIATES THEREOF
申请人:Prevacus, Inc.
公开号:US20150175650A1
公开(公告)日:2015-06-25
The present invention relates to the synthesis of ent-progesterone and intermediates thereof.
本发明涉及ent-孕酮及其中间体的合成。
[EN] C-20 STEROID COMPOUNDS, COMPOSITIONS AND USES THEREOF TO TREAT TRAUMATIC BRAIN INJURY (TBI), INCLUDING CONCUSSIONS<br/>[FR] COMPOSÉS STÉROÏDES EN C-20, COMPOSITIONS ET UTILISATIONS ASSOCIÉES POUR TRAITER UNE LÉSION CÉRÉBRALE TRAUMATIQUE (TBI), NOTAMMENT DES COMMOTIONS
申请人:PREVACUS INC
公开号:WO2016044559A1
公开(公告)日:2016-03-24
The present invention relates to C-20 steroid compounds, compositions and methods of use thereof to treat, minimize and/or prevent traumatic brain injury (TBI), including severe TBI, moderate TBI and mild TBI, including concussions.
[EN] C-20 STEROID COMPOUNDS, COMPOSITIONS, AND USES THEREOF TO TREAT TRAUMATIC BRAIN INJURY (TBI), INCLUDING CONCUSSIONS<br/>[FR] COMPOSÉS STÉROÏDES C-20, COMPOSITIONS ET UTILISATION DE CEUX-CI POUR TRAITER UN TRAUMATISME CRANIOCÉRÉBRAL (TCC), Y COMPRIS DES COMMOTIONS CÉRÉBRALES
申请人:PREVACUS INC
公开号:WO2016209847A1
公开(公告)日:2016-12-29
The present invention relates to C-20 steroid compounds, compositions and methods of use thereof to treat, minimize and/or prevent traumatic brain injury (TBI), including severe TBI, moderate TBI and mild TBI, including concussions.
Antiviral purine derivatives with improved gastrointestinal absorption
申请人:Beecham Group p.l.c.
公开号:US05252575A1
公开(公告)日:1993-10-12
Compounds of formula (I) and pharmaceutically acceptable salts thereof: ##STR1## wherein R.sub.1 is hydrogen or hydroxy; and R.sub.2 is C.sub.1-6 alkyl; which are pro-drugs for 9-(3-hydroxyprop-1-oxy)guanine having antiviral activity, a process for their preparation and their use as pharmaceuticals.