On the absolute stereochemistry of (−)-4-alkylnonan-2-ones
摘要:
The alcohols (S)-(C5H11CH)-C-n(R)CH2OH (R = Me, Et) have been prepared by Evans' alkylation chemistry (>98% e.e.). For R = Me [alpha](D) = -15.5 (c 0.31, MeOH); for R = Et [alpha](D) = +6.8 (c 0.31, MeOH). Equivalent alcohols are obtained by Baeyer-Villiger oxidative cleavage of (S)-(-)-(C5H11CH)-C-n(R)CH2COMe (R = Me, 85% e.e.; R = Et, 62% e.e.) derived from catalytic asymmetric conjugate addition. Thus, AlMe3 or ZnEt2 addition to the Si face of the enone generates a (-) antipode with a 4S stereocentre. (C) 2002 Elsevier Science Ltd. All rights reserved.
[EN] HYDROXY FORMAMIDE DERIVATIVES AND THEIR USE<br/>[FR] DÉRIVÉS D'HYDROXY FORMAMIDE ET LEUR UTILISATION
申请人:GLAXOSMITHKLINE IP NO 2 LTD
公开号:WO2015104684A1
公开(公告)日:2015-07-16
Disclosed are compounds having the formula (I): wherein R1, R2 and R3 are as defined herein, and methods of making and using the same, including use as inhibitors of BMP1, TLL1 and/or TLL2 and in treatment of diseases associated with BMP1, TLL1 and/or TLL2 activity.
Disclosed are compounds having the formula:
wherein R1, R2 and R3 are as defined herein, and methods of making and using the same, including use as inhibitors of BMP1, TLL1 and/or TLL2 and in treatment of diseases associated with BMP1, TLL1 and/or TLL2 activity.
A flexible convergent enantioselective totalsynthesis of a rigid lipoxin B4 analog incorporating a 6, 11‐methylene bridge has been developed. C1–C12 aldehyde and C13–C20 ketophosphonate underwent highly efficient key Horner olefination. A final six‐step sequence delivered the target compound displaying all stereogenic centers with standard lipoxin B4 configurations.
A Concise Route to the Proposed Structure of Lydiamycin B, an Antimycobacterial Depsipeptide
作者:Wenhua Li、Jiangang Gan、Dawei Ma
DOI:10.1021/ol9024474
日期:2009.12.17
The total synthesis of four possible isomers with the proposed structure of antimycobacterial depsipeptide lydiamycin B is achieved. None of them shows identical NMR data with those reported for natural lydiamycin B, indicating that further structural revisions are required.