Simple and Efficient Synthesis of (+)-Methyl 7-Benzoylpederate, a Key Intermediate toward the Mycalamides
摘要:
[GRAPHICS]A simple and efficient method for the synthesis of (+)-methyl 7-benzoylpederate, the left half of pederin, mycalamides, onnamides, and theopederins, was developed, The key reactions include the Evans asymmetric aldol reaction, a thioacetalization-lactonization, a stereoselective Claisen condensation, and a Takai-Nozaki olefination, The synthesis requires only nine steps and proceeds in 26% overall yield.
Simple and Efficient Synthesis of (+)-Methyl 7-Benzoylpederate, a Key Intermediate toward the Mycalamides
摘要:
[GRAPHICS]A simple and efficient method for the synthesis of (+)-methyl 7-benzoylpederate, the left half of pederin, mycalamides, onnamides, and theopederins, was developed, The key reactions include the Evans asymmetric aldol reaction, a thioacetalization-lactonization, a stereoselective Claisen condensation, and a Takai-Nozaki olefination, The synthesis requires only nine steps and proceeds in 26% overall yield.
Enantioselective aldol condensations: The use of ketone boron enolates with chiral ligands attached to boron.
作者:Ian Paterson、M.Anne Lister、Cynthia K McClure
DOI:10.1016/s0040-4039(00)85065-0
日期:1986.1
Aldolcondensation between diethylketone and simple aldehydes using(lpc)2BOTf/iPr2NEt in CH2Cl2 gives syn-adducts in good ee (66–90%) and with high diastereoselectivity(≥90%). Other chiral dialkylboron triflate reagents examined give lower ees.