作者:Philip J. Kocienski、Robert Narquizian、Piotr Raubo、Christopher Smith、F. Thomas Boyle
DOI:10.1055/s-1998-1803
日期:1998.8
Mycalamide B, a potent antitumour agent, was synthesized from cheap, readily available starting materials: ethyl lactate, ethyl isobutyrate, 4-chlorobutanal, and 4-chlorobutanoyl chloride. The trioxabicyclo[4.4.0]decane ring system was created by reaction of a methoxymethyl ether with a silyloxyoxirane induced by phosphorus pentoxide.
A Synthesis of 6-Tributylstannyl-3,4-dihydro-2H-pyrans via Coupling of Enol Triflates with (Bu3Sn)(Bu)CuLi·LiCN
作者:Tanya Wildman、Philip J. Kocienski、Robert Narquizian、William G. Whittingham
DOI:10.1055/s-2002-20041
日期:——
Enoltriflates derived from 6- and 7-membered ring lactones (6 cases) react with (Bu 3 Sn)(Bu)CuLi.LiCN in THF at -78°C to give the corresponding α-tributylstannyl cyclic enol ethers in 54-85% yield.
A synthesis of the insect toxin pederin (1) based upon the union of metallated dihydropyran 8 with the oxamate ester derivative 9 is described. Noteworthy features include (a) a new method for the construction of metallated dihydropyrans which tolerates heteroatom functionality and (b) a rhodium-catalyzed hydroboration reaction which enables stereocontrolled formation of the stereogenic centre at C10.