Total Synthesis of (<i>R</i>)-Sarkomycin Methyl Ester via Regioselective Intermolecular Pauson–Khand Reaction and Iridium-Catalyzed Asymmetric Isomerization
A new five-step enantioselective synthesis of (R)-sarkomycin methyl ester is described. The cyclopentane scaffold was built by a regioselective intermolecular Pauson–Khandreaction. Enantioselectivity was introduced by a novel Ir-catalyzed isomerization reaction. The last steps involved a catalytic hydrogenation of the exocylic double bond, followed by the deprotection and elimination of the amino
Total Synthesis of (<i>R</i>)-Sarkomycin via Asymmetric Rhodium-Catalyzed Conjugate Addition
作者:Johannes Westmeier、Steffen Kress、Christopher Pfaff、Paultheo von Zezschwitz
DOI:10.1021/jo4016979
日期:2013.11.1
using a five-step total synthesis. Key steps in the enantioselective construction of the targeted scaffold were a rhodium-catalyzed asymmetric conjugate alkenyl addition with subsequent silyl trapping and a Mukaiyama aldolreaction with aqueous formaldehyde. Protection of the hydroxy group as a THP acetal and oxidative cleavage of the C,C-double bond provided a stable direct precursor to the natural
Sarkomycin A methyl esters and functionalized cyclopentane blocks for brefeldin A
作者:A. M. Gimazetdinov、G. V. Ishmurzina、M. S. Miftakhov
DOI:10.1134/s1070428012010022
日期:2012.1
Sarkomycin A methyl esters and functionalized cyclopentane blocks for brefeldin A were synthesized starting from diastereoisomeric (1R,2S)- and (1S,2R)-2-hydroxymethyl-N-[(1R)-1-phenylethyl]cyclopent-3-ene-1-carboxamides.