AbstractThe tert‐butyl group is a common aliphatic motif extensively employed to implement steric congestion and conformational rigidity in organic and organometallic molecules. Because of the combination of a high bond dissociation energy (~100 kcal mol−1) and limited accessibility, in the absence of directing groups, neither radical nor organometallic approaches are effective for the chemical modification of tert‐butyl C−H bonds. Herein we overcome these limits by employing a highly electrophilic manganese catalyst, [Mn(CF3bpeb)(OTf)2], that operates in the strong hydrogen bond donor solvent nonafluoro‐tert‐butyl alcohol (NFTBA) and catalytically activates hydrogen peroxide to generate a powerful manganese‐oxo species that effectively oxidizes tert‐butyl C−H bonds. Leveraging on the interplay of steric, electronic, medium and torsional effects, site‐selective and product chemoselective hydroxylation of the tert‐butyl group is accomplished with broad reaction scope, delivering primary alcohols as largely dominant products in preparative yields. Late‐stage hydroxylation at tert‐butyl sites is demonstrated on 6 densely functionalized molecules of pharmaceutical interest. This work uncovers a novel disconnection approach, harnessing tert‐butyl as a potential functional group in strategic synthetic planning for complex molecular architectures.
The present invention provides a compound of formula (I):
wherein the variants R1, R2, R3, R4, R5, R6, R7 are as defined herein, and wherein said compound is an inhibitor of CETP, and thus can be employed for the treatment of a disorder or disease mediated by CETP or responsive to the inhibition of CETP.
4-benzylamino-1-carboxylacyl-piperidine derivatives as CETP inhibitors
申请人:Novartis AG
公开号:US08193349B2
公开(公告)日:2012-06-05
The present invention provides a compound of formula (I):
wherein the variants R1, R2, R3, R4, R5, R6, R7 are as defined herein, and wherein said compound is an inhibitor of CETP, and thus can be employed for the treatment of a disorder or disease mediated by CETP or responsive to the inhibition of CETP.
Method of inhibiting CETP activity with 4-benzylamino-1-carboxylacyl-piperidine derivatives
申请人:Mogi Muneto
公开号:US08420641B2
公开(公告)日:2013-04-16
The present invention provides a compound of formula (I):
wherein the variants R1, R2, R3, R4, R5, R6, R7 are as defined herein, and wherein said compound is an inhibitor of CETP, and thus can be employed for the treatment of a disorder or disease mediated by CETP or responsive to the inhibition of CETP.
4-Benzylamino-1-carboxyacyl-piperidine derivatives as CETP inhibitors useful for the treatment of diseases such as hyperlipidemia or arteriosclerosis
申请人:Novartis AG
公开号:EP2463282A1
公开(公告)日:2012-06-13
The present invention provides a compound of formula (I):
wherein the variants R1, R2, R3, R4, R5, R6, R7 are as defined herein, and wherein said compound is an inhibitor of CETP (cholesteryl ester transfer protein), and thus can be employed for the treatment of a disorder or disease mediated by CETP or responsive to the inhibition of CETP.