A convenient cross-coupling route to α,β,γ,δ-unsaturated amino acids
作者:Mark J. Burk、John G. Allen、William F. Kiesman、Karen M. Stoffan
DOI:10.1016/s0040-4039(97)00065-8
日期:1997.2
β-Bromoenamide esters are coupled stereospecifically to vinylboronic acids via a palladium-catalyzed Suzuki reaction. This cross-coupling proceeds under mild conditions with Pd(OAc)2 in 95% EtOH at 50 °C and produces amino acids with 1,3-diene side chains in high yields.
A Versatile Chemo-Enzymatic Route to Enantiomerically Pure β-Branched α-Amino Acids
作者:Geoffrey J. Roff、Richard C. Lloyd、Nicholas J. Turner
DOI:10.1021/ja049499d
日期:2004.4.1
A series of diastereoisomers of beta-methyl-beta-phenylalanine analogues 1a-f have been prepared in enantiomericallypure form using a combination of chemo- and biocatalysis. Starting from l-threonine methyl ester 2, a range of beta,beta-disubstituted didehydroamino acids were obtained as their (Z)-isomers 6a-f. Asymmetric hydrogenation of these alkenes, using either the [Rh(R,R)-Et-DuPhos(COD)]BF4
Design and Synthesis of Prolylcarboxypeptidase (PrCP) Inhibitors To Validate PrCP As A Potential Target for Obesity
作者:Changyou Zhou、Margareta Garcia-Calvo、Shirly Pinto、Matthew Lombardo、Zhe Feng、Kate Bender、KellyAnn D. Pryor、Urmi R. Bhatt、Renee M. Chabin、Wayne M. Geissler、Zhu Shen、Xinchun Tong、Zhoupeng Zhang、Kenny K. Wong、Ranabir Sinha Roy、Kevin T. Chapman、Lihu Yang、Yusheng Xiong
DOI:10.1021/jm101013m
日期:2010.10.14
Prolycarboxypeptidase (PrCP) is a serine protease that may have a role in metabolism regulation. A class of reversible, potent, and selective PrCP inhibitors was developed starting from a mechanism based design for inhibiting this serine protease. Compound 8o inhibits human and mouse PrCP at IC(50) values of 1 and 2 nM and is not active (IC(50) > 25 mu M) against a panel of closely related proteases. It has lower serum binding than its close analogues and is bioavailable in mouse. Subchronic dosing of 8o in PrCP and WT mice at 100 mg/kg for 5 days resulted in a 5% reduction in body weight in WT mice and a reduction in PrCP KO mice.
A highly enantioselective asymmetric hydrogenation route to β-(2R,3S)-methyltryptophan
作者:R. Scott Hoerrner、David Askin、R.P. Volante、Paul J. Reider
DOI:10.1016/s0040-4039(98)00604-2
日期:1998.5
Asymmetric hydrogenation of a protected (Z)-dehydro-beta-methyltryptophan derivative 2 with (R,R)-Me-DuPHOS-Rh catalysis was achieved in 97 % ee. Deprotection then afforded (2R,3S)-beta-methyltryptophan 1. (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis of α,α-Difluorinated Phosphonate pSer/pThr Mimetics via Rhodium-Catalyzed Asymmetric Hydrogenation of β-Difluorophosphonomethyl α-(Acylamino)acrylates
for α,α-difluorinated phosphonate mimetics of phosphoserine/phosphothreonine utilizing rhodium-catalyzed asymmetric hydrogenation was developed. The dehydrogenated substrate β-difluorophosphonomethyl α-(acylamino)acrylates were first prepared from protected serine/threonine followed by asymmetric hydrogenation using the rhodium–DuPhos catalytic system to generate the chiral center(s). These important