Total Synthesis of 2‘-O-Methylmyxalamide D and (6E)-2‘-O-Methylmyxalamide D
摘要:
Hetero-bis-metalated 1,3,5-hexatrienes are employed in the linchpin coupling of synthetic fragments for the convergent construction of the central pentaene of the antifungal agent 2'-O-methylmyxalamide D and its (6E) isomer. Sequential Stille and Suzuki-Miyaura couplings interpolate the boron/tin triene into the pentaene chain. The total synthesis of O-methylmyxalamide D and its (6E) isomer was accomplished efficiently.
Efficient and Selective Syntheses of (all-<i>E</i>)- and (6<i>E</i>,10<i>Z</i>)-2′-<i>O</i>-Methylmyxalamides D via Pd-Catalyzed Alkenylation−Carbonyl Olefination Synergy
作者:Guangwei Wang、Zhihong Huang、Ei-ichi Negishi
DOI:10.1021/ol801115s
日期:2008.8.7
Highly efficient and selective syntheses of both (all- E) and (6 E,10 Z)-isomers of 2'- O-methylmyxalamide D ( 2 and 3), in which the crucial conjugated pentaene moieties were assembled in > or =98% stereoselectivity through the use of two Pd-catalyzed alkenylation reactions, the Horner-Wadsworth-Emmons (HWE) olefination, and either the Corey-Schlessinger-Mills modified (CSM-modified) Peterson olefination